This is an example of an airborne defensive player maintaining verticality, thus this a legal defensive play. Regardless if he is positioned inside the Restricted Area, a secondary defender does not commit a blocking foul if contact is made while he is jumping vertically in an attempt to defend the shot. Note also that the defender must establish legal guarding position prior to the start of the offensive player’s upward motion before jumping vertically. On this play, the defensive player jumps straight up and down in an attempt to defend his opponent’s field goal attempt. As the contact on the play is initiated by the offensive player, and it is marginal in nature, there is foul on this play.