here comes william the man......
and you'd only hurt your knuckles if your a pussy.
since the punch is centreline and straight, the mass of the forearm is supporting the mass of the fist (think of why a spear only requires a small force to penetrate), as is the mass of the entire body (if needed) if performing advancing step during the punch.
It has been done in practise because I've seen it and even done it once. Granted I can't provide evidence of this short of getting the poor sap who was on the receiving end to join this forum, but I don't think that's happening
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