agreed. my guess is that the would be punt blocker just took the wrong path and whiffed on the ball.
but even if he was trying to make a flying tackle on the punter, nothing illegal about that---unless the punter somehow manages to get the kick off.
you can't rough the kicker if you in fact prevent him from kicking it. you could still have a personal foul, of course. but I dont believe this hit--had it been a punt preventing tackle-- would've qualified as PF. (defender didn't launch himself into the ball carrier's head; didn't lead with a forearm, etc)