The pivot punch, which is barred, is a blow delivered by whirling around and striking at an opponent with the side or back of the hand or the wrist. The half-pivot, or backhand blow, also barred, is struck by bringing the hand back after missing, and so landing with the side or back of the hand, with the chance of making it a blow with the wrist.
Haw. Code R. § 16-74-142