Does Sims's little rocking motion he does out of the stretch not risk a balk? Seems like after he brings his leg back, he very slightly lifts it and moves it forward and rocks a little bit. It's obviously not part of his pitching motion, but it seems like Umps (maybe just lower level umps) basically treat any forward movement towards the plate after being on the rubber as the start of a pitch, and therefore a balk if the pitcher doesn't follow through and throw to the plate.
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