 How were Jig and Bucky attacked by the Vapor snakes?
The Blue Behemoth By LEIGH BRACKETT Shannon's Imperial Circus was a jinxed space-carny leased for a mysterious tour of the inner worlds. It made a one-night pitch on a Venusian swamp-town—to find that death stalked it from the jungle in a tiny ball of flame. I've wet-nursed Shannon's Imperial Circus around the Triangle for eleven years, and I know. Bucky Shannon sighed, and let his fist start traveling, a long, deceptive arc. It was Gow, our zoo-man—a big, ugly son-of-a-gun from a Terran colony on Mercury. The only other one on the Triangle belongs to Savitt Brothers, and she's much smaller than Gertrude."
 They had been released by someone on purpose
 They had been released by someone on purpose  Bucky had released them while inebriated  They had gone into the wrong enclosure.  They had escaped their tanks in search of food.