It soaked up part of the beam and left the rest, like a well-fed cat rejecting an overplus of milk. It darted past Durham and into the taxi, where it bounced agilely, once and twice. Wanbecq and Wanbecq-ai fell down on the floor. The doors closed softly and the taxi mechanism whirred and the rail hummed as it took off, heading back to the main terminal. The darkbird returned to Durham. Susan said in a strange voice, "What is that?" "Never mind now. Come on." He started to drag her toward the ramp that led down from the platform. She fought him. She was getting hysterical, and he didn't blame her. The darkbird followed along behind. When they reached the level, Susan planted her feet mulishly and refused to go any farther. "I don't dare leave you alone out here," he said desperately. "Come along to the ship and the captain will see that you get back safely--" The darkbird circled and dived at Susan. She bolted. It dived at Durham. He bolted too, off to the right, to the edge of the apron, where he caught up with Susan again. They ran between the storage sheds, onto a spur of the freight-belt system. It was still now, not carrying any freight. They tried to run across it to the other side, but the darkbird drove them back. It was immediately apparent, of course, that the thing was herding them. He shouted at it to let Susan alone, but it did not pay any attention to him. And he thought, it wants us to go somewhere, so it won't knock us out. Maybe? It's worth a try. He took Susan and jumped off the belt and ran. The darkbird touched him, ever so gently. He tried to yell, gave up, and tottered back where it wanted him to go, with every nerve in him pulled taut and twangling in a horrible half-pleasurable fashion that made his legs and arms move unnaturally, as though he were dancing. The darkbird followed, once again placid and unconcerned. They went along the belt for some distance. It was limber, sagging a bit between the giant rollers, and it boomed under their feet with a sharp slapping sound. Susan stumbled so often he picked her up and carried her. There was nobody to call to, nobody to ask for help. The towering ships were far away. The darkbird nudged him again at last, out across a landing apron where a very strange looking ship stood in the solitary majesty of impending take-off. The flood lights were blinking at twenty-second intervals, visual warning to stand clear, and Durham ran staggering as through a strobo-scopic nightmare, with the white-faced girl in his arms. Dark, light. Black, bright. A haze of exhaustion swam before his eyes. Things moved in it, jerky shapes in an old film, in an antique penny peep show. Day, night. Dark, bright. The things moved closer, unhuman things clad in fantastic pressure suits. Durham screamed.