Set up in vertical stack. 1 is the iso, and works with the two handlers (6 and 7). Ideally, 1 is set up on the force side of the disc, leaving the inside break open.
Hypothetical: 1 cuts break side and doesn't get the disc. handler looks to reset.
1 finds himself out of position, so he calls himself out and clears to the 4th position in the stack. 2 is the new iso.
Hypothetical 2: Disc moves to the break side but is not in the end zone.
from hypothetical 2: The 5 can come for the continuation. Note that the 5 should stay near the back of the end zone as long as possible, in case other movement is coming (i.e. upline cuts from handlers).