A and D are together against B and C. B "looses" the ball to M1.
At the same time A and D performs a contra and are pressed by B and C.
M1 throws the ball to A or D.
The player, who receives the ball, runs directly against the goal and shoots or passes to her teammate, if she is in a better position for a shot.
The ball is picked up and the players go behind M2's goal
E and H are together against F and G and so on....

When all the players have attacked and defended once the exercise is restarted from M2's goal and the attackers becomes the defenders and reverse.