This play is from the horizontal stack. The first cuts come from 3 and 5. At the same time that 3 and 5 make their initial cut, 7 can make a deep cut while 1 waits. Once 3 and 5 make the second cut, 3 should get the disc and be looking for 7 coming back under. At that time, 1 should be making a deep cut for the continuation play.