Being in raven form doesn't last. He probably could talk in that form, give Bobbie the explanation she deserved, but there was no need. The bird shifts, and in a short amount of time, Bran's back in human form, watching the flames eat at the manager's office. They'd need to go soon, but there was time enough.

"Every living being has a story. We--my kind, the Corax--we're tasked to save as many stories as we can. That's why. That's why I can't turn away, either--those people lived. They meant something to someone, somewhere. Someone's gonna miss them, though we did our best to avenge them, at least."

The Snickers bar, at least, has a sibling (or three, really) somewhere in his coat, so he fishes one out and offers it over. The other one, even if it's gross? That won't go to waste--one of Bran's raven-kin will probably find it and eat its insides, at some point. Or a raccoon will. Either way.