I guess my question would be, which mind had the nightmare? I think Banner's would be about losing control a destroying everyone and everything, Future Imperfect. I think Hulk's would be forever being powerless, weak. But it was the moment he saw what he had done to those people, the fear in their eyes, the destruction he had caused, that made him pause. As far as Banner choking the life out of her, I think that was about her being so stupid to put the world in that kind of danger.