Originally posted by xmarksthespot
How does he regenerate in what can basically be considered t=0 seconds?
same way as he manages to gain mass without taking it from his environment.
basically, each of Flash's punches will inflict a trace amount of damage, which will instantaneously be countered by The Hulk's body, so that they don't build up to becoming a massive punch.
think about it, how does Hulk amp up exponentially anyway? it's not a physiologically rationalised process, it's comics it happens it's a part of the character's essential 'being', that's as much as can be said, really.