Step 1

They're in a Horizontal Stack. We're forcing forehand. Notice where (4) is.

Step 2

They initiate.

Step 3

(5) comes under and is open

Step 4

"JAWS!" (3) sprints into the throwing lane

Step 5

The throw is likely to go off immediately and (3) needs to come straight towards the sideline.

Step 6

Then (3) closes in and reestablishes the force.