1 calls "X" to elevate 2. 1 hits 2 and screens 4's defender. 4 cuts to the ball side block looking for the post feed from 2.
If 4 is not open, 1 pins down for 5 to the high post as 4 back screens for 3 to the ball side block. 2 can hit 3 coming off the screen or 5 on the high-low to 3.