This is an example of a verticality play that results in a correct no call. In this example Blue 1 drives at the basket and is challenged at the rim by Red 18. Defender Red 18 is entitled to his position on the floor and is allowed to jump vertically within his cylinder. As Blue 1 elevates the defender also elevates and jumps vertically, staying within his cylinder. This is a legal play and this contact is deemed as incidental.