As it has been rightly pointed out, a player can'tpass or tap the ball forward, for himself or anyone else. However, the point that some of you are missing is, Stewart wasn't in possession of the ball prior to tapping it forward. This is the key to the whole argument.
The point you are missing is that Stewart did have possession of the ball and deliberately tapped the ball forward for himself. It was all in one motion, but he had control of the ball when he deliberately tapped it forward.