I still don't understand why Carlos Vela goal is disallowed for offside. In the replay i saw there is one SA defender on the goal line. But the replay keep make the offside line from the keeper who is in front of Vela. Then the commentator keep saying it is a correct decision. Is there any rules when there is a corner the offside line measured from the keeper? I still don't get it, can somebody give me some explanation?