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The book does say that a pitcher may not use a slingshot-type pitch. Bringing the hand to the top on the backswing is typical of a slingshot delivery.
I think that you need to focus on the release point. With a slingshot delivery I think that the hips would still be open and the elbow and wrist would break on the release. That is what would make this an illegal pitch in MP rather than the height of the back swing.
But like Dakata, I've never called MP so I am going on my pitching knowledge and the rule book.
Curious - FP rules allow for the drag of the pivot foot as long as it remains in contact with the ground. MP does not have that statement. Does that infer that the pivot foot must remain in contact with the plate until the ball has been released?
WMB
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