Verticality applies to a legal position. Following are the basic components of the principle of verticality:
ART. 1 . . . Legal guarding position must be obtained initially and movement thereafter must be legal.
ART. 2 . . . From this position, the defender may rise or jump vertically and occupy the space within his/her vertical plane.
ART. 3 . . . The hands and arms of the defender may be raised within his/her vertical plane while on the floor or in the air.
ART. 4 . . . The defender should not be penalized for leaving the floor – vertically or having his/her hands and arms extended within his/her vertical plane.
ART. 5 . . . The offensive player whether on the floor or airborne, may not “clear out” or cause contact within the defender’s vertical plane, which is a foul.
ART. 6 . . . . The defender may not “belly up” or use the lower part of the body or arms to cause contact outside his/her vertical plane, which is a foul.
ART. 7 . . . The player with the ball is to be given no more protection or consideration than the defender in judging which player has violated the rules.