>>432605There's multiple means by which a person can be knocked out, some of which can be lessened by conditioning, some of which improve (or degrade) simply with age, and some of which are physiological and do not change.
What we see in that webm is just a lesson on physics and it falls under the "physiological/will not change" end of things because it was a concussive shot that rattled the other kids brain. If anything, it can best be compared to a lever system: The further away you are from the desired target (the brain) on a lever (the skull mass) the less force you'll need to exert (on the chin/jaw) to get the same results (as hitting in a closer area to the brain, i.e. the top of the head). By hitting the jaw, which is not only flexible (ideal for transferring energy) but also further from the brain than the top of the head or any other part of the skull, enough concussive force was pushed on the brain to jostle it and knock the other kid down. Remember that, for however much distance the black kid moved the other kids jaw with his punch, the same amount of movement affected the other side of his skull, and by extension everything else that was inside, by transfer of momentum and energy.
So yeah... Even with that wimpy punch without much hip action, it jostled the brain enough to send the other kid reeling and in a heavy fog.