There's nothing wrong with a palm in hook to the head, but usually it's at longer range. And yes, palm down is a bit slower, but in close, you get that palm down and elbow up and it's deadyl.... like a battering ram effect. All the weight is behind the punch, while with a palm in, the elbow tends to drop and there's less weight behind your fist and more potetial for torque. It really is simple physics... force = lever cos theta.
IMO, one of the prettiest inside left hooks ever is Holyfield. I just love the way he throws it.
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