This is an example of a defensive foul, where the defender’s arms extend over the offensive player’s vertical space. Post defenders must maintain a vertical position in order to be considered as having a legal position when contact occurs. On this play, while the post defender’s body is vertical, his arms are tilted forward over the vertical space of his opponent. Even though contact is then initiated by the offensive player’s upward shooting motion, the foul is called on the defender for being in an illegal position at the time of contact.