I would flag this. This isn't a natural motion, and is strictly being done to distract the defense. I would also flag swinging of the arms, if excessive, by the recievers. I would not flag a head turn or slight movements if not done in a manner to simulate the start of the play. This would be one of those "spirit of the rule" situations and not a "letter of the law" .
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I'm due to make a great call. After all, I've been officiating a long time !!!
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