Starting Positions. 1 passes to 3 and screens for 2. Defense switches and X1now has 2 and X2 has 1. The problem is that X1 and jump switch and deny the pass to 2, stalling the drill.
 

In the same starting positions, 1 will again pass to 3 and begin screening action towards 2 on the wing.
 

Just before 1 sets his down screen on X2, he stops and gets screening angle on his own man, X1
 

2 cuts off 1's screen (on X1) and cuts to the open spot on top of the floor. 2's defender, X2, has no one to guard now. X1 and X2 are BOTH guarding 1.

This is a proven strategy against switch and junk defenses and is rarely defended properly by the defense