This is an example of a charging foul.  An offensive player with the ball must expect to be guarded and be prepared to stop or change direction whenever a defensive player establishes a legal guarding position. In this example, White 1 is guarding ball-handler Black 0 in transition and establishes an initial legal guarding position by facing Black 0 with both feet on the floor. White 1 then maintains his legal guarding position by moving backwards and laterally when Black 1 causes illegal contact with White 1’s torso. This is a charging foul by Black 0.