This is an example of an airborne defensive player maintaining verticality in a legal defensive play. Even 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. On this play, the defensive player jumps straight up and down in an attempt to contest his opponent’s field goal attempt. As the contact on the play is initiated by the offensive player, and it is marginal, the defender is legal.