A slim fighter-bomber, with square-tipped, backswept, wings, was jetting up in almost perpendicular flight; another was coming in toward the landing stage, and, as they watched, a flight of rockets leaped forward from under its wings. Cardon saw the orderly-driver of the ambulance jump down and start to run for the open lift-shaft. He got five steps away from his vehicle. Then the rockets came in, and one of them struck the tarpaulin-covered pile of boxes beside the ambulance. There was a flash of multicolored flame, in which the man and the vehicle he had left both vanished. Immediately, the screen went black. The fireworks had mostly exploded at the first blast; however, when Cardon and Major Slater and one or two others reached the top landing stage, there were still explosions. A thing the size and shape of a two-gallon kettle, covered with red paper, came rolling toward them, and suddenly let go with a blue-green flash, throwing a column of smoke, in miniature imitation of an A-bomb, into the air. Something about three feet long came whizzing at them on the end of a tail of fire, causing them to fling themselves flat; involuntarily, Cardon's head jerked about and his eyes followed it until it blew up with a flash and a bang three blocks uptown. Here and there, colored fire flared, small rockets flew about, and firecrackers popped. The ambulance was gone, blown clear off the roof. The other 'copters on the landing stage were a tangled mass of wreckage. The 20-mm was toppled over; the gunner was dead, and one of the crew, half-dazed, was trying to drag a third man from under the overturned gun. The control tower, with the two 12-mm machine guns, was wrecked. The two 7-mm's that had been left on the top had vanished, along with the machine gunners, in a hole that had been blown in the landing stage. Cardon, Slater, and the others dashed forward and pulled the auto-cannon off the injured man, hauling him and his companion over to the lift. The two rakish-winged fighter-bombers were returning, spraying the roof with machine-gun bullets, and behind them came a procession of fifteen big 'copters. They dropped the lift hastily; Slater jumped off when it was still six feet above the floor, and began shouting orders. "Falk: take ten men and get to the head of this lift-shaft! Burdick, Levine: get as many men as you can in thirty seconds, and get up to the head of the escalator! Diaz: go down and tell Sternberg to bring all his gang up here!" Cardon caught up a rifle and rummaged for a bandolier of ammunition, losing about a minute in the search. The delay was fortunate; when he got to the escalators, he was met by a rush of men hurrying down the ascending spiral or jumping over onto the descending one. "Sono guns!" one of them was shouting. "They have the escalator head covered; you'll get knocked out before you get off the spiral!"