As a coach and not an umpire, I would consider a 9U game to be instructional. As a coach, I would have corrected that motion in practice. At that age I think it would have been entirely appropriate for the umpire to go out to the mound and ask the pitcher's coach to come on out for an instructional chat. If he continued to pitch that way, let it go since their was no advantage and no real applicable penalty to be enforced.
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