[Banner looked vaguely worried at suddenly having Batman in his grill, but if you were good enough at reading faces you might be able to tell that he was more worried about Batman than he was about himself.]

This won't be the last time someone tries it, or the first. I encourage you to help them if you can because they will probably die. Hell I'll even give you a blood sample myself if you really want me to.

But, the Other Guy isn't going to cooperate. That's not really what he does.