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Does fighting lead to concussions? Yes. When a guy is "stunned" by a punch such that he falls, that "stun" is a momentary loss of consciousness due to the fact that the spongy brain and its intricate neural circuitry has been thrown into sudden acceleration by the punch, and just as suddenly decelerated by the skull that contains it.
Mind you, blindside hits to the head, delivered by a skater at speed, tend to deliver even worse concussions than fights, simply because the forces (velocity and rotation) tend to be greater.
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