Player 1 takes the catch immediately after a pass.
The next player to pass the ball takes the pass, but is "defended in front" and cannot avoid it.
The player goes behind the post, the "defender" stays in front of the post, the player behind the post pulls away, gets the ball and shoots.
Ball is caught, played out and the exercise is done again.
This can be done with or without defenders.
With defenders, the defenders must over-defend and stay in front of the post when the player moves backwards.
Without defenders, make sure that attackers keep making the correct movements and do not immediately move backwards to move away, but only when they have been "pre-defended