If 3 passes back to coach, 5 backscreens (backscreen for passers).
If X3 goes over the screen (ballside), 5 will re-screen then roll to the post.
Play to a stop or score, the attackers can score on the downscreen, and pass again to coach for another backscreen.
Pitt has X3 go under the backscreen and X5 stands up a cutter going over the top. Or if X3 can crowd 3 and go the same route, that's the best way to go.