The Case book play says "the pitcher is bent at the waist and his pitching arm naturally hangs down slightly in front or to the side away from his body. As he looks to the catcher for a signal, a) the pitcher's arm is stationary, or b) the arm rocks slightly from side to side. RULING: in a) the position of the arm is natural and can be considered by his side in meeting the rule. Any movement would then start the pitch. In b) any movement of the arm is considered the start of the pitching motion and a pitch must be delivered to the plate so this motion results in a balk."
SO, he can hang the arm down there, but he cannot move it.
The Rules book has no new wording, so the Case book interp is the only thing that is new.
JJ
PS I have a copy of the 2010 Rules book and Case book, and this play is on page 51 of the Case book.
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