[rcaverly]

Originally Posted by Rich Ives

Post a video. I don't get the "rocks back" part.

I'm visualizing F1 beginning his motion to pitch with his NP leg and arm movement.

OBR 6.02 (5.07)(f ),(g),(i),(j) Pitcher Illegal Action (a) (8.05) Balks
If there is a runner, or runners, it is a balk when:
(1) The pitcher, while touching his plate, makes any motion naturally associated with his pitch and fails to make such delivery;