Then he saw, sitting in a front row seat, the girl who had lent him her gun on his first day in Tetrahyde. She was as beautiful as he had remembered her; but no hint of emotion touched her pale, oval face. She stared at him with the frank and detached interest of someone watching an unusual bug under a jar.

"Let the contest begin!" the loudspeaker announced.

Barrent had no more time to think about the girl, for the machine was rolling toward him.

He circled warily away from it. Max extruded a single slender tentacle with a white light winking in the end of it The machine rolled toward Barrent, backing him toward a wall.

Abruptly it stopped. Barrent heard the clank of gears. The tentacle was withdrawn, and in its place appeared a jointed metal arm which ended in a knife-edge. Moving more quickly now, the machine cornered him against the wall. The arm flickered out, but Barrent managed to dodge it. He heard the knife-edge scrape against stone. When the arm withdrew, Barrent had a chance to move again into the center of the room.

He knew that his only chance to disable the machine was during the pause when its selector changed it from one killing mode to another. But how do you disable a smooth-surfaced turtle-backed machine?

Max came at him again, and now its metal hide glistened with a dull green substance which Barrent immediately recognized as Contact Poison. He broke into a spring, circling the room, trying to avoid the fatal touch.

The machine stopped. Neutralizer washed over its surface, clearing away the poison. Then the machine was coming toward him again, this time with no weapons visible, apparently intending to ram.

Barrent was badly winded. He dodged, and the machine dodged with him. He was standing against the wall, helpless, as the machine picked up speed.

It stopped, inches from him. Its selector clicked. Max was extruding some sort of a club.