The center back rotates to the corner vacated by the line digger. The other back-row player moves to the opposite corner. The key player in this defense is the off blocker, who must react to the set, then quickly get to the primary digging position before the attacker contacts the ball. The strong point of this defense is that the backcourt players have only one responsibility, which is playing the driven balls. The off blocker theoretically has all tips.
Players play out the ball.
This can also be used with any defense.