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He just misplayed it which is essentially what he said after the game.
He was also early on the play so he could have been called for pass interference if he had followed through with his original move rather than going for his legs.
He just screwed up, play and simple.
He dove to the side to avoid hitting the receiver, and thereby [in his mind] avoiding a PI and /or penalty for hitting a defenseless receiver;
BY doing so, he gave up the unthinkable, nearly impossible TD.
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