Rule sets / NCAA / Free Foot Swing
Free Foot Swing
Once the pitcher's free (stride) foot swings past the back edge of the rubber, the pitcher is committed to delivering home. The only exception is a throw to second base on a pickoff play.
When the pitcher starts the delivery from the set position and the entire free foot or any part of the stride leg breaks the plane of the back edge of the pitcher's plate, the pitcher is committed to throw or feint a motion toward second base or pitch to home plate.