5 starts a ball screen for 1 to the right side, then slips to the block.
 

4 follows the slip with a ball screen for 1. 5 looks to seal in lane and get a post feed from 1.
 

If the post feed is not open, 1 passes back to 4, who enters into a dribble handoff with 2 as 5 sets a flex screen for 3. 2 drives over the top.
 

4 sets a weakside pin screen for 3. 2 can dump to 5 in short corner or kick back to 3 for the shot.