Spike and short ball

First variant (left-hand side of the diagram):

A spikes the ball to B or C. This players digs the ball back to A, after which A plays a short ball in the direction of the other player. The other player moves towards A, plays the ball back to A, and moves back to his starting position.

Second variant (right-hand side of the diagram):

A spikes the ball to B or C. The players digs the ball back to A, after which A plays a short ball to the left or the right for the other player. This player moves towards the ball and plays it back to A.

The player that plays the short ball moves backwards in a straight line after playing the ball. When necessary, the other player takes the old position of the player that is playing the short ball, as shown in the diagram.

Because A is allowed to spike hard, you could work with an extra spare player that holds a spare ball. If a player is unable to dig a spike, the spare player can take the position of this player will he fetches the ball.