The player at the elbow will go and set a screen on the player along the baseline.
Once the screen is set the player receiving the screen will cut up towards the elbow.
The screener will roll to the basket.
This screen is to get a player open that is away from the ball.
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.
Good spacing is only the start. The best modern offences teach players to attack the defence's rotations and play in a permanent 4-on-3 - here is how to coach that read.
The ball screen produces almost half of all professional offensive possessions, yet most teams still teach it as a memorised play. The modern approach trains the read - giving players a framework to decide based on what the defence does, not what the coach called.