I nelieve that the Pitcher clearly stops his motion.......NFHS Runners on base BALK ... No runners on base Illegal pitch. After he starts his movement to pitch, he must continue the motion without interruption or alteration.6-1-2 For the wind-up position, the pitcher is not restricted as to how he shall hold the ball. A pitcher assumes the windup position when his hands are: (a) together in front of the body; (b) both hands are at his side; (c) either hand is in front of the body and the other hand is at his side. The pitcher’s non-pivot foot shall be in any position on or behind a line extending through the front edge of the pitcher’s plate. He is limited to not more than two pumps or rotations. After he starts his movement to pitch, he must continue the motion without interruption or alteration. With his feet in the wind-up position, the pitcher may only deliver a pitch or step backward off the pitcher’s plate with his pivot foot first. After the pitcher has placed his pivot foot clearly behind the plate, he has the right to change to the set position or throw or feint to a base the same as that of any infielder. During delivery, he may lift his non-pivot foot in a step forward, a step sideways, or in a step backward and a step forward, but he shall not otherwise lift either foot.