Section 74. Verticality
Art. 1. Verticality applies to a legal position. The basic components of the principle of verticality are:
a. Legal guarding position must be established and attained initially, and movement thereafter must be legal.
b. From such position, the defender may rise or jump vertically and occupy the space within his or her vertical plane.
c. The hands and arms of the defender may be raised within his or her vertical plane while the defender is on the playing court or in the air.
d. The defender shall not be penalized for leaving the playing court vertically or having his or her hands and arms extended within the vertical plane.
e. The offensive player, whether on the playing court or airborne, shall not “clear out” or cause contact that is not incidental.
f. The defender may not “belly up” or use the lower part of the body or arms to cause contact outside his or her vertical plane.
g. The player with the ball shall be given no more protection or consideration than the defender in the judging of which, if either, player has violated the principle of verticality.