Tony's insistence both comforts and bewilders Bruce. As... relieving as it is to know that there's somebody who doesn't fear the other guy, Bruce also doesn't understand why Tony trusts him so much. How can Tony put this much stock in him when Bruce can't even come to trust himself?

He raises his head just a little, enough to meet Tony's gaze as he worries on his bottom lip, uncertainty clear on his features. "That was just a one time thing. Next time you might not be as lucky." Next time, the other guy might just hurt Tony instead - and that's one of the last thing that Bruce wants.