Can't believe people are debating the penalty decision.
99 times out a 100 that's going to be given. His arm was in an unnatural position and wafted the ball out of play. It's a penalty according to all the rules as commonly interpreted. It is why, week in and week out, you do see defenders with there arms lowered and hardly ever see arms flapping about above head height. Defenders don't do that because, intentional or not, if there is ball-hand contact and the hand is raised, it's going to be a penalty.