I don't believe this for a second, that was a design pump fake to the screen to go downfield. The defender fell down down field and Dobbs still took so long he had time to stand back up and get in the play on what should have been a walk into the end zone untouched.
You can say many many thing about Dobbs and there are things he does well, but the guy can't throw the ball and it has nothing to do with an injury real or imaginary.