Bruce can eat almost anything but that doesn't mean that he doesn't have preferences, and he's not nearly hungry enough to eat alien creatures that for all he knows could be sentient. At least if it's a dead sentient on a plate, it won't try to communicate with him.

And he can't help but feel somewhat responsible for Tony when he's the reason that Tony's here in the first place. Eventually he just ends up grabbing Tony's belt loop just to keep from being separated from him in the crowds. It's either that or a leash.

And then Tony spots the doll and all Bruce can do is roll his eyes and hand over the credit stick. "You realize it isn't going to fit in a suit to take it home?"