These two verticality examples result in correct no calls from the same game. In the first example, Black 21 drives to the rim. Defender White 12 establishes legal guarding position and is entitled to his position on the floor and is allowed to jump vertically within his cylinder.

As Black 21 elevates, the defender also elevates and jumps vertically, staying within his cylinder. This is a legal play and this contact is deemed as incidental. In the second example, Black 10 drives hard at the rim and defender White 12 elevates at the same time, making legal body contact within his cylinder and cleanly blocking the ball.