Step 1

you approach the endzone and transition into vertical stack.

Step 2

Handler with the disc calls "ISO (insert player name, aka 4). Everyone else clears to back of endzone while echoing the call (ISO 4)

Step 3

ISO now has entire endzone to work with.

Step 4

Note: any position in the stack can be ISO. Sometimes the stack might not even be fully set. Try to avoid picks.

Step 5