He went by the zebra corral where a small boy was picking up stones and turned into the side entrance of the wing. He went down the dim corridor, turned left at the men's room, then right and left again, and came finally to a small yard partially hidden from the main enclosure by an extension of the wing. In the yard was only one exhibit, a beaver pool surrounded by a waist-high stone wall. Two teen-aged boys sprawled on the wall; otherwise the place was deserted. Mr. Kemper studied the boys. Here was game to his liking. He went over and sat down on a bench in the sun. The boys, twins in levis, saddle-shoes, T-shirts and long hair, leaned over the pool. There was something odd about the actions of the blond one who tilted dangerously near the water. He moved, spasmodically, and Mr. Kemper saw the flicker of sunlight on the long stick held like a spear in his hand, and heard a splash. Cursing, the boy pushed himself upright and dropped from the wall, shaking water from the stick. "You missed," said the other one. "I'll show that flat-tailed rat," said the blond boy. From a back pocket he took a clasp-knife and snapped it open, and from a side pocket a length of twine. With swift, vicious twists he started to tie the knife-handle to the end of the stick. He made two knots and said, "Man, look at that. That'll hold it, man." "What about the cat on the bench over there? What if he sees us?" "Him? So what if he does? We can handle him. Anyway, he's got his eyes shut, ain't he?" The sun tingled on the tops of Mr. Kemper's ears as he listened, his eyes half-shut. "Okay, give me lots of room on the wall," the blond boy said. There was a rasping of cloth on stone. Then Mr. Kemper closed his eyes and made a picture in the darkness of his mind, a small, bright picture that he blotted out immediately after it was formed. By the pool, metal clattered on stone. The blond boy yelled, "Hey, what'd you shove me for? Look what you did!" "Me? I never touched you, you jerk!" "The hell you didn't. Look at that damn knife!" Opening his eyes, Mr. Kemper looked at the pieces of knife blade scattered at the boy's feet and, a little to one side, the broken stick. He smiled and settled back on the bench, listening to the argument. The boys shouted and waved their arms, but that was all. As for their invective, he felt it lacked originality; he tired of it quickly. He got up from the bench and walked toward them. The argument stopped. They looked at him with cold arrogant eyes. "Hello," he said. They looked away. "You hear something, man?" said the blond boy. "Not a thing, Jack, not a thing," the other answered.