If you know anything about marking at corners, he did the right thing coming of the post slightly. When the ball goes past him to other side of field he is supposed to drift slightly to his left to cover behind Friedel. He did that but Sharner got a free head and it was a cracking header into the far corner. If he had been beat on his left and stayed on the post people would be saying why didn't move off the post. He can't win either way with some of you guys but let's forget about the defender who gave him a free header.
I do know something about marking at corners, do you?
You are meant to drift, but not that much. The point of being on the post is that you cover everything between yourself and the post, then back the keeper to keep out the rest.
If it had beaten him on his otherside no one would have said anything because he did his job on the post and the keeper and defenders got beaten.