There is a reason that blitz came from the right side, and why it was so effective. I have since rewatched the game and I am now 100% sure that Sam’s arm was not healthy. And it is more of just a shoulder issue. How he held the football was the most obvious (that was mentioned after his TD run). But he continued to favor his right side. Unless he is now left handed that is unusual. And what some are saying that he was locking on to receivers, was in fact a physical issue that was causing, at least to some degree, discomfort when he panned his head left to right. If you watch it you will see a smooth motion until he gets roughly to center, then it just locks and he starts moving his torso to compensate. This little quirk continued through the fourth quarter, and ultimately to the safety.
Which leads me to point out that someone else saw it too. OU not only blitzed Sam’s right side. They made sure to bring it from as far out as they could and still have time to get to Sam, while trying to find a blind spot in his peripheral vision. The defender held off until Sam turned his head to his left, once he did he never looked back to his right and was screwed. I believe healthy he would have picked it up.