Presteign shook him off and watched the cannister curve up and then down toward the nose of "Vorga," spinning and glinting in the cold sunlight. At the edge of the pit it was caught by the anti-gray beam and flicked upward as by a giant invisible thumbnail. Up and up and up it whirled, one hundred, five hundred, a thousand feet. Then there was a blinding flash, and an instant later a titanic clap of thunder that smote ears and jarred teeth and bone.