Here we have a vertical stack in the end zone. In this stack the 1 or the front will cut first and is the iso.
The 1 will then not go to the open side as most would expect and should instead go straight to the breakside, and the handler should look to make this inside throw to the breakside. It's a tricky throw, but the play hinges on it being made, so best done against a bad mark. Notice how the 5 starts to continues rather than the 2 as normal flow would suggest. The 2 still cuts, but more to distract markers, rather than actually Recieve the disc.