>>7307144This. It's basically a loophole in the rules, akin the how closed-fist punches are legal if you're airborne. An inverted atomic drop is not a "low blow" because it's technically not a "blow" at all: your opponent's own body has all of the momentum, while your knee remains essentially stationary. There's no rule against throwing an opponent in such a way that it causes him to land on his crotch.