It wasn't that Bruce was snooping so much as hovering on the outskirts at first, since walking into situations usually took him a few seconds of psyching up. Especially when handling new people. He heard Tony's voice first and that at least was a reassurance, it was always easier to have someone else take the brunt of a conversation. Bruce did better as a fly on the wall or a side presence. He listened carefully to Alex's last sentence and shuffled in.

"If they've evolved for that purpose, it must mean lifeforms have been here for a very long time to learn to manipulate. Unless their evolutionary instincts are instantaneous." It wouldn't be the strangest ability of an advanced species, but Bruce in general was fascinated in the the situation they found themselves in. He liked to solve puzzles. He naturally moved to hover on the edges of Tony's space, smiling faintly at Alex. "Then again, if it works on all other fauna here too, there's that."