Warren brought out the crude arrow he had made with a centimeter-thick slat from the Manamix lifeboat. He had tapered it down and driven a nail in the head. He tucked the arrow into the rubber strip of his bow and tested it. The arrow had a line on it and did not fly very straight. Not much good for fish.

He slitted his eyes against the glare and looked out at the shallow troughs. The sea warped and rippled where the thing had just disappeared. Warren sensed that it had judged them now and was gliding back in the blue shadows under the raft, coming around for its final pass. It would not see the shirt until it turned and that would bring it up and near the corner where Warren now stood, between its path and Rosa. He drew the arrow back in a smooth motion, sighting, straining, sighting—

Rosa saw the dim shape first. She flicked the rag out of the water with a jerk. Warren saw something dart up, seeming to come up out of the floor of the ocean itself, catching the refracted bands of light from the waves.

Rosa screamed and stepped back. The snout broke water and the mouth like a cut was leering at them and Warren let go the arrow thunk and followed it forward, scrabbling on all fours. The thing had the arrow in under the gills and the big flaps of green flesh bulged and flared open in spasms as it rolled to the side.

Warren snatched at the arrow line and missed. “Grab the end!” he called. The arrow was enough to stun the Swarmer but that was all. The thing was stunned with the nail driven deep in it, but Warren wanted more of it now, more than just the killing of it, and he splashed partway off the raft to reach the snout and drag it in. He got a slippery grip on a big blue ventral fin. The mouth snapped. It thrashed and Warren used the motion to haul it toward the raft. He swung himself, the wood cutting into his hip, and levered the body partway onto the deck. Rosa took a fin and pulled. He used the pitch of the deck and his weight to flip the thing over on its side. It arched its back, twisting to gain leverage to thrash back over the side. Warren had his knife out and as the thing slid away from him he drove the blade in, slipping it through soft tissue at the side and riding up against the spine. Warren slashed down the body, feeling the Swarmer convulse in agony. Then it straightened and seemed to get smaller.

The two stood back and looked at the scaly green body, three meters long. Its weight made the raft dip and turn in the swell.

Something sticky was beginning to drain from the long cut. Warren fetched a can and scooped up the stuff. It was a thin, pale yellow fluid. He did not hear Rosa’s whimpering, stumbling approach as he lifted the can to his lips.

He caught the cool, slightly acrid taste of it for an instant. He opened his mouth wider to take it in. She struck the can from his hands. It clattered on the deck.

His punch drove her to her knees. “Why?” he yelled. “What do you care—”

“Wrong,” she sputtered out. “Ugly. They’re not … not normal … to … to eat.”

“You want to drink? Want to live?”

She shook her head, blinking. “Na … ah, yeah, but … not that. Maybe …”

He looked at her coldly and she moved away. The carcass was dripping. He wedged it against a log and propped cans under it. He drank the first filled can, and the second.

The dorsal and ventral fins sagged in death. In the water he had seen them spread wide as wings. The bulging brain-case and the goggle eyes seemed out of place, even in the strange face with its squeezed look. The rest of the body was sleek like the large fish. He had heard somebody say that evolution forced the same slim contours on any fast thing that lived in an ocean, even on submarines.

The Swarmer had scaly patches around the forefins and at each ventral fin. The skin looked as though it were getting thick and hard. Warren did not remember seeing that in the photographs of dead ones, but then the articles and movies had not said anything about the Swarmer scouts either until a year ago. They kept changing.

Rosa crouched under the lean-to. Once, when he drank, she spat out some word he could not understand.

The third can he set down on the boards halfway between them. He cut into the body and found the soft pulpy places where it was vulnerable to an arrow. He learned the veins and arteries and ropes of muscle. There were big spaces in the head that had something to do with hearing. In the belly pouch the strand was shriveled and laced with a kind of blue muscle. Around the fins where the skin became scaly there were little bones and cartilage and gristle that did not seem to have any use.

Rosa edged closer as he worked. The heat weighed on her. She licked her lips until they were raw and finally she drank.

He kept track of the days by making a cut each morning in a tree limb. The ritual sawing became crucial, part of the struggle. The itching salt spray and the hammering of the sun blurred distinctions. In the simple counting he found there was some order, the beauty of number that existed outside the steady rub of the sea’s green sameness.

Between the two of them they made the killing of the Swarmers a ritual as well. The scouts came at random intervals now, with never more than three days of waiting until the next thumping probes at the planking. Then Rosa would stoop and wave the shirt in the water. The thing would make a pass to look and then turn to strike, coming by the jutting corner, and Warren would drive the arrow into a soft place.

Rosa would crouch under the shelter then and mumble to herself and wait for him to gut it and bleed the watery pouches of fin fluid and finally take the sour syrup from behind the eyes.

With each flesh kill he learned more. They cut up some cloth and made small bags to hold the richer parts of the carcass and then chewed it for each drop. Sometimes it made them sick. After that he twisted chunks of the flesh in a cloth bag and let the drops air in the sun. That was not so bad. They ate the big slabs of flesh but it was the fluid they needed most.

With each kill Rosa became more distant. She sat dreamily swaying at the center of their plank island, humming and singing to herself, coiling inward. Warren worked and thought.

On the twenty-first day of drifting she woke him. He came up reluctantly from the vague, shifting sleep. She was shouting.

Darting away into the bleak dawn was something lean and blue. It leaped into the air and plunged with a shower of foam and then almost in the same instant was flying out of the steep wall of a wave, turning in the gleaming fresh sun. “A Skimmer,” he murmured. It was the first he had ever seen.

Rosa cried out.

Warren stared out into the hills and valleys of moving water, blinking, following her finger. A gray cylinder the size of his hand floated ten meters away.

He picked up the tree limb they used for marking the days. His hands were puffed up now from the constant damp, and the bark of the limb scraped them. No green shapes moved below. He rocked with the swell, waiting at the edge of the raft for a random current to bring the gray thing closer.

A long time passed. It bobbed sluggishly and came no closer. Warren leaned against the pitch of the deck and stretched for it. The limb was short at least a meter.

He swayed back, relaxing, letting the clenching in his muscles ease away. His arms trembled. He could swim to it in a few quick strokes, turn and get back in a few—

No. If he let go he would be sucked into the same endless caverns that Rosa was wandering. He had to hold on. And take no risks.

He stepped back. The thing to do was wait and see if—

White spray exploded in front of him. The lean form shot up into the air and Warren rolled back away from it. He came up with the knife held close to him.