I think it's too big of an adrenalin rush to simply stop to celebrate for a second. If you're at a football (soccer) match and your team scores a goal, no one in the crowd bothers to check if the goal has been allowed, they just go crazy, it's natural human instinct.

Saying that, pac man did initally go to offer Hatton help or even see if he was ok, but Kenny pushed him out of the way and sent him back to his corner if I remember rightly.