I don't know the circumstances behind it, but with my girlfriend's game we're playing, anytime she'd enter conversation with a story character and I was in the room, it'd default to letting me handle the conversation even though she was the one who initiated it. It's a little backwards in that regard

Random note, but one other thing I love is that the game saves via profiles much like BioWare games. And it has a good assortment of auto-saves, much like Skyrim. That way you can have your co-op game, and your personal game separate without any risk of accidentally overwriting one, because they're on separate profiles. How I WISH Bethesda would impliment this sort of thing in their games. Never actually happened, but I've always ALMOST overwrote games in Fallout and Elder Scrolls games when playing multiple characters