Position

[Tom Cook]

When a player with position of the ball (A1) takes a long stride and the defense follows, in effect, stradling the pivot foot of A1, does A1 have the right to return to his//her upright position, and does B1 have to give the space back?

[BktBallRef]

The defender has violated the offensive player's vertical space. If there's illegal contact, it's a foul on the defender.