1 starts with the disc. 2 cuts forward, 1 throws to 2.
2 catches, 1 cuts forward (give-and-go) for the pop pass from 2.
1 passes to 3, 2 cuts deep
3 passes to 2 (either deep look or short pass, dependent on conditions & player skill)
Finish
1 moves to 2 queue, 2 moves to 3 queue, 3 picks up a new disc, and drill starts again with 3&4 in the other direction.