B rolls, "looses" or throws the ball to M1 and immediately after runs against the opposite goal.
A runs a couple of steps forward, receives the ball from M1 and immediately throws the ball to B, who shoots.
After the shot B gets the ball und runs behind own line, while A runs back to the starting position.
C throws the ball to M1 and so on....
Remember to switch players.
The exercise can be performed while running on the opposite side.