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I'm no MLB Umpire but it looks like an illegal pitch to me, based on the following:
OBR 8.01(a) in part "From this position any natural movement associated with his delivery of the ball to the batter commits him to the pitch without interruption or alteration. He shall not raise either foot from the ground, except that in his actual delivery of the ball to the batter, he may take one step backward, and one step forward with his free foot.
Underline added for emphasis
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