Coming back the shooter rebounds and outlets (ballside), the other big rim runs. Here the ball is reversed through the trailer into a pick and roll.
Repeat up and back.
Variation - replace coaches with players.
Dave D'Aveiro - the first big runs to the T, seals, and goes to the ballside block for a pass, the posts switch roles coming back. Progression - the first big is on the T, the trailer ballscreens for a guard who goes by the screen to the middle, the posts exchange positions, the guard passes to the high post who shoots or looks for the low post (Fist).