This brings up something I never thought of before. I didn't see the play but based on the description, there is no foul here. If he did that and stopped but another player started in motion within a second of him stopping, you would have an illegal motion penalty (not all players were set for 1 second before the player went in motion).
This makes me wonder though...if the kicker starts forward before the snap and is still moving forward at the snap, you technically have an illegal motion. I can't imagine anyone would ever flag that because he is not gaining any kind of an advantage (unless they run a fake and he's getting a head start on going downfield).
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