There are more uses for a punch than that. I often use them for off-balancing to set up grappling, for instance. And injuring punches can take a person out of the fight, eventually. Of course, if you meant "knock him out of the fight", then we're on the same page.well , the purpose of punch is to a) knock your opposing number out, or b) set him up for a knock out, therefore if your big punch lands and doesn't have the efficiency to do that, then it doesn't work, it only annoys him