"They went to track down the snake." Lapis replies, still a little twitchy on the whole considering that she'd really rather not mess with a giant snake, but if Steven said it wouldn't attack them...

Also Lapis has significantly less experience with corrupted Gems other than the already bubbled one Peridot had in the barn, so she has no idea what any of this means other than 'Wild animal' and 'Dangerous'.