Step 1

Set up as indicated with someone setting the stack

Step 2

The back of the stack will make an initial cut to the open side

Step 3

As the disc gets thrown to that cutter, the number "2" in the stack needs to start their butterfly cut.

Step 4

Right when the initial cutter catches the disc, they should know the number 2 is already cutting.

Step 5

The initial cutter then needs to throw a continuation deep to the cutter making the butterfly.

Step 6