Did you watch the replay???
You do realise he's not in the air don't you?
Is it impossible to jump for a header with your hands tucked by your sides? They teach all footballers how to do this to avoid giving fouls away, being the expert you seem to want to pretend you are I would have thought you'd know this was possible.
More importantly if you had bothered to watch the replay(it sounds very much like you haven't)
his hand goes out infront of him not to the side... do you do a superman pose every time you head a ball simon?
You may argue "he's off balance", that's his own doing it's like excusing a player for mistiming a player the way you're going on.