Set up the box.
3 and 4 need to signal to each other who will cut in and who will cut deep.
At stall four the handler needs to face up 2 for a bail or swing. 2 will activate their cut from there. 3 and 4 need to allow for an in-cut if their first cut-in is not successful.
If 2 successfully gets the disc, 3 and 4 react before the throw for a cut to follow up.
Again, 1 is there as a bail/swing, and 3 and 4 need to give the second handler the in-cut option.