Split Infinity

  He walked slowly up to her. The unicorn watched him warily. There was something about the way her horn oriented on him that was disquieting. It was without doubt a weapon. It tapered to a sharp point; it was a veritable spear. This was a fighting animal. Scratch one assumption: he could in no way afford to ignore that horn.

  “Now my name’s Stile,” he said in a gentle voice. “Stile as in fence. You may not know about that sort of thing, though. I need a—a steed. Because I may have a long way to go, and I can get there faster and better if I ride. I am a very good endurance runner, for a man, but a man does not compare to a good h—unicorn. I would like to ride you. What is your name?”

  The unicorn blew a double note through her horn. This startled Stile; he had not realized the horn was hollow. He had been speaking rhetorically, expecting no response. Her note was coincidental, of course; she could hardly be expected to comprehend his words. It was his tone of voice that mattered, and the distraction of it while he approached. Yet that note had sounded almost like a word. “Neysa?” he asked, voicing it as well as he could.

  There was a fluted snort of agreement—or so it seemed to him. He reminded himself to be careful how he personified animals; if he ever got to believing he was talking with one on a human basis, he’d have to suspect his own sensibility. He could get himself killed, deluding himself about the reaction of a creature with a weapon like that.

  “Well, Neysa, what would you do if I just got on your back and rode you?” He had to keep talking, calming her, until he could get close enough to mount her. Then there would be merry hell for a while: a necessary challenge.

  The unicorn whipped her horn about in a menacing manner, and stomped her left forefoot. Her ears flattened back against her head. The language of unicorns was obviously like that of horses, with absolutely clear signals—for those who knew how to interpret them. She might not comprehend the specific meaning of his words, but she knew he was encroaching, and was giving adequate warning. If he tried to ride her, she would try to throw him, and if he got thrown, he would be in serious trouble. This was indeed no tame animal; this was a creature who knew of men and did not fear them, and when sufficiently aggravated would kill. A wildcat was not merely a housecat gone wild; a unicorn was not merely a horse with a weapon. The whole psychology differed. Neysa’s every little mannerism told him that. He had no doubt, now, that there was blood on her horn—from other creatures who had failed to heed her warnings.

  Yet he had to do it. “Neysa, I’m sorry. But a demon tried to kill me, not long ago, and in this frame of magic I am not well equipped to protect myself. I need to get away from here, and I’m sure you can take me so much better than I can take myself. Men have always depended on horses—uh, equines to carry them, before they started messing with unreliable machines like automobiles and spaceships.” He stepped closer to her, hand outstretched, saying anything, just so long as he kept talking.

  She lifted both forefeet in a little prance and brought them down together in a clomp directed at him. Her nose made a hooking gesture at him, and she made a sound that was part squeal and part snort and part music—the sort of music played in the background of a vid-show when the horrible monster was about to attack. This was as forceful a warning as she could make. She would not attack him if he departed right now, as she preferred simply to graze and let graze, but she would no longer tolerate his presence. She was not at all afraid of him—a bad sign!—she just didn’t like him.

  Now Stile remembered the folklore about unicorns, how they could be caught only by a virginal girl; the unicorn would lay his head in her lap, and then an ambush could be sprung. Probably this had been a cynical fable: how do you catch a mythical animal? With a mythical person. Implication: virgins were as rare as unicorns. Clever, possibly true in medieval times—and beside the point. How would it relate to a man and a female unicorn? Would she put her head in his lap? Only to un-man him, surely! More likely the matter related to riding: only a person pure in spirit could ride a unicorn—and in such myths, purity was defined as sexual abstinence and general innocence. Stile had no claims to such purity. Therefore this could be a very difficult ride. But mythology aside, he expected that sort of ride anyway.

  “I really am sorry to do this, Neysa,” Stile said. And leaped.

  It was a prodigious bound, the kind only a highly trained athlete could perform. He flew through the air to land squarely on the unicorn’s back. His hands reached to take firm grip on her mane, his legs clamped to her sides, and his body flattened to bring him as close to her as physically possible.

  Neysa stood in shocked surprise for all of a tenth of a second. Then she took off like a stone from a catapult. Stile’s body was flung off—but his hands retained their double grip on her mane, and in a moment his legs had dropped back and were clamping her sides again. She bucked, but he clung close, almost standing on his head. No ordinary horse could buck without putting its head down between its front legs; it was a matter of balance and weight distribution. Neysa managed it, however, providing Stile with just a hint of what he was in for. Normal limits were off, here; this was, for sure, a magic animal.

  She reared, but he stayed on her like a jacket. She whipped her head about, spearing at him with her horn—but he shifted about to avoid it, and she could not touch him without endangering her own hide. That horn was designed to spear an enemy charging her from the front, not one clinging to her back. It took a special kind of curved horn to handle a rider; she would never dislodge him this way.

  So much for the beginning. Now the unicorn knew that no amateur bestrode her. It would require really heroic measures to dump him. For Stile, when he wasn’t trying to gentle an animal, was extremely tough about falls.

  Neysa accelerated forward, going west toward the chasm cracks he had spied from the spruce tree—then abruptly braked. All four feet skidded on the turf. But Stile was wise to this maneuver, and remained secure. She did a double spin-about, trying to fling him off by centrifugal force—but he leaned to the center of the turn and stayed firm. Abruptly she reversed—and he did too. She leaped forward—then leaped backward. That one almost unseated him; it was a trick no ordinary horse knew. But he recovered, almost tearing out a fistful of her mane in the process.

  Well! Now she was warmed up. Time to get serious. Neysa tripped forward, lowering her body—then reared and leaped simultaneously. She fell backward; then her hind feet snapped forward and she performed a flip in air. For an instant she was completely inverted, her entire body above his. Stile was so startled he just clung. Then she completed the flip, landing on her front feet with her body vertical, finally whomping down on her hind feet.

  Only the involuntary tightening of his hands had saved him. A horse doing a backflip! This was impossible!

  But, he reminded himself again, this was no horse. This was a unicorn—a creature of fantasy. The mundane rules simply did not apply here.

  Next, Neysa went into a spin. She galloped in a tightening circle, then drew in her body until she was actually balanced on one forefoot, head and tail lifted, rotating rapidly. Magic indeed. Stile hung on, his amazement growing. He had known he would be in for a stiff ride, but he had grossly underestimated the case. This was akin to his fight with the demon.

  Well, maybe that was a fair parallel. Two magical creatures, one shaped like a humanoid monster, the other like a horse with a horn. Neither subject to the limitations of conventional logic. He had been foolish to assume that a demon that superficially resembled a horse was anything close to that kind of animal. He would remember this lesson—if he happened to get out of this alive.

  Now Neysa straightened out, stood for a moment—then rolled. Her back smacked into the ground—but Stile had known when to let go. He landed on his feet, and was back on her back as she regained her own feet. “Nice try, Neysa,” he said as he settled in again.

  She snorted. So much for round two. She had only begun to fight!

  Now she headed for the nearest copse
of trees. Stile knew what was coming: the brush-off. Sure enough, she passed so close to a large trunk that her side scraped it—but Stile’s leg was clear, as he clung to her other side in the fashion of a trick rider. He had once won a Game in which the contest was trick riding; he was not the finest, but he was good.

  Neysa plunged into a thicket. The saplings brushed close on either side, impossible to avoid—but they bent aside when pushed, and could not sweep off a firmly anchored rider who was prepared. She shot under a large horizontal branch, stout enough to remove him—but again he slid around to the side of her body, avoiding it, and sprang to her back when the hazard was past. Real riding was not merely a matter of hanging on; it required positive anticipations and countermoves to each equine effort. He could go anywhere she could go!

  Neysa charged directly toward the next large tree, then planted her forefeet, lifted her rear feet, and did a front-foot-stand that sent her back smashing into the trunk. Had he stayed on her, he would have been crushed gruesomely. No game, this! But Stile, now wise in the ways of unicorns, had dropped off as her motion started. He had less mass than she, weighing about an eighth as much, and could maneuver more rapidly when he had to. As her rear feet came back to the ground, Stile’s rear feet came back to her back, and his hands resumed their clutch on her mane.

  She snorted again. Round three was over. Round four was coming up. How many more tricks did this phenomenal animal have? Stile was in one sense enjoying this challenge, but in another sense he was afraid. This was no Proton Game, where the loser suffered no more than loss of status; this was his life on the line. The first trick he missed would be the last.

  Neysa came onto a grassy plain. Now she accelerated. What was she up to this time? It didn’t seem so bad—and that made him nervous. Beginning with a walk, she accelerated to a slow trot. The speed differential was not great, as a slow trot could be slower than a brisk walk. In fact, Stile had worked with lazy horses who could trot one meter per second, rather than the normal three or four meters per second. The distinguishing mark was the beat and pattern. In walking, the horse put down the four feet in order, left-front, right-rear, right-front, left-rear, four beats per cycle. Trotting was two-beat: left-front and right-rear together, followed by right-front and left-rear together. Or with a right lead instead of a left. The point was that the motion of each front foot was synchronous with one hind foot; in some cases the front and rear moved together on the same side. But there were only two beats per cycle, the pairs of feet striking the ground cleanly together. It made for a bumpy but regular ride that covered the ground well, and looked very pretty from the side. A slow trot could be gentle; a fast one could be like a jackhammer. But a trot was definitely a trot, at any speed; there was no mistaking it. Stile liked trotting, but distrusted this one. He knew he had not seen the last of this mare’s devices.

  Next she broke into a canter; three-beat. Left-front, then right-front and left-rear together, and finally right-rear. Like a cross between a walk and a trot, and the ride a kind of gentle swooping. All perfectly conventional, and therefore not to be trusted. She had something horrendous in her canny equine mind!

  Finally she reached a full gallop: a modified two-beat cycle, the two front legs striking almost but not quite together, then the rear two. A four-beat cycle, technically, but not uniform. Beat-beat, beat-beat, at the velocity of racing. Stile enjoyed it; he experienced an exhilaration of speed that was special on a horse—unicorn. Motored wheels could go much faster, of course, but it wasn’t the same. Here, as it were in the top gear, the animal straining to the limit—though this one was not straining, but loafing at a velocity that would have had another one straining—

  The unicorn shifted into another gait. It was a five-beat—

  Stile was so surprised he almost dropped off. No horse had a five-beat gait! There were only four feet!

  No horse—there he was again. He kept forgetting and getting reminded in awkward ways. This gait was awful; he had never before experienced it, and could not accommodate it. BEAT-beat-BEAT-BEAT-beat, and over again, bouncing him in a growing resonance, causing him to lose not his grip but his composure. He felt like a novice again, fouling himself up, his efforts to compensate for the animal’s motions only making it worse. As a harmonic vibration could shake apart a building, this fifth-beat was destroying him. He would fall—and at this breakneck velocity he could … break his neck.

  Think, Stile, think! he told himself desperately. Analyze: What is the key to this gait?

  His hands were hurting as his clutch on the unicorn’s mane slowly slipped. His thigh muscles were beginning to cramp. Stile was expert—but this creature had his number now. Unless he could get her number too, soon.

  Four feet, five beats. One foot had to repeat, Number the steps: one-two-three-four—where was the repeat? Fingers slipping …

  BEAT-beat—that sound was less than the others, like a half-step. But half a step had to be completed by—another half-step. Like a man catching his balance when tripped. Two half steps—that was it. Not necessarily together. The second and fifth. The right rear foot—as though stumbling, throwing off his timing. Compensate—

  Stile started to catch on. He shifted his weight to absorb the shock and irregularity. BEAT-absorb-BEAT-BEAT-absorb. It was tricky and unnatural as hell, but his body was finding the dubious rhythm, getting the swing. Mostly it was his knowledge of the pattern, of what to expect. No more surprises! His leg muscles relaxed, and his hands stopped slipping.

  Neysa felt the change, and knew he had surmounted this challenge too. She turned at speed—and Stile’s inertia almost flung him off her side. A gradual turn at high velocity could pack more wallop than a fast turn at low speed. But she had to shift to a normal gallop for the turn, and no equine living could dump Stile with a normal gallop.

  Realizing her mistake, the unicorn changed tactics. She slowed, then suddenly went into a one-beat gait. This was another surprise, in a ride full of them. It was like riding a pogo stick. All four of her feet landed together; then she leaped forward, front feet leading—only to contract to a single four-point landing again.

  But Stile had ridden a pogo stick, in the course of his Game experience. He could handle this. “No luck, Neysa!” he cried. “Give up?”

  She snorted derisively through her horn. It was almost as if she understood his words. But of course horses were very perceptive of tone, and responsive to it.

  She turned. She had been going north, having curved in the course of her running; now she bore due west. Round five was coming up.

  The grass gave way to packed dirt, then to clay, then to something like shale, and finally to rock. Neysa’s hooves struck sparks from the surface, astonishing Stile. She was traveling fast, to be sure—faster than any horse he had raced. It felt like eighty kilometers per hour, but that had to be a distortion of his perception; such a speed would be of interworld championship level, for a horse. Regardless, hooves were not metallic; this animal was not shod, had no metal horseshoes, no nails. Nothing to strike sparks. Yet they were here.

  Now she came to the pattern of crevices he had spied from the tree. They loomed with appalling suddenness: deep clefts in the rock whose bottoms could not be seen. Her hooves clicked between cracks unerringly, but Stile didn’t like this. Not at all! One misstep would drop a foot into one of those holes, and at this speed that would mean a broken leg, a tumble, and one man flying through the air to land—where? But all he could do was hang on.

  The cracks became more plentiful, forming a treacherous lattice. His vision of the crevices blurred, because they were so close, passing so rapidly; they seemed to writhe in their channels, swelling and shrinking, now twisting as if about to burst free, now merging with others or splitting apart. He had noted a similar effect when riding the Game model train as a child, fixing his gaze on the neighboring tracks, letting them perform their animations as he traveled. But these were not rails, but crevices, getting worse.

  Neysa danced
across the lattice as Stile watched with increasing apprehension. Now these were no longer mere cracks in a surface; these were islands between gaps. Neysa was actually traversing a chasm, jumping across from stone to stone, each stone a platform rising vertically from the depths. Stile had never seen such a landscape before. He really was in a new world: new in kind as well as in region.

  Now Neysa was leaping, using her one-beat gait to bound from one diminishing platform to another. Sometimes all four feet landed together, in a group, almost touching each other; sometimes they were apart, on separate islands. She was obviously conversant with this place, and knew where to place each hoof, as a child knew where to jump amid the squares of a hopscotch game, proficient from long practice. Perhaps Neysa had mastered this challenge in order to avoid predators. No carnivore could match her maneuvers here, surely; the creature would inevitably misstep and fall between islands, perhaps prodded by the unicorn’s aggressive horn, and that would be the end. So her trick gait made sense: it was a survival mechanism. Probably the five-beat gait had a similar function. What terrain was it adapted to?

  Neysa danced farther into the pattern. The islands became fewer, smaller, farther apart. Now Stile could peer into the lower reaches of the crevices, for the sunlight slanted down from almost overhead. Had it been only six hours from the start of this day? It seemed much longer already! The fissures were not as deep as he had feared; perhaps two meters. But they terminated in rocky creases that could wedge a leg or a body, and they were getting deeper as the unicorn progressed. This was a test of nerve as much as of agility or riding ability.

  As it happened, Stile had the nerve. “Let’s face it, Neysa,” he said. He tended to talk to horses; they listened well, politely rotating their pointed furry ears around to fetch in larger scoops of his sound, and they did not often talk back. “We’re in this together. What would I gain by falling off now? A broken leg? If it’s all the same to you, oh prettiest and surest-footed of equines, I’ll just stay on.” He saw her left ear twitch as if shaking off a fly. She heard him, all right, and was not pleased at the confidence his tone exuded.