Step 1

O3 passes to O1. D1 and D2 shift across together, staying close enough to help each other, and don't chase.

Step 2

O1 passes along the line to O2 in the corner. That is the trigger: D1 presses O2 and D2 moves across to cut off O3.

Step 3

D1 blocks the pass back down the line and D2 blocks the pass across. O2 tries it anyway and D2 steps in to win it.

Step 4

A point for the pressers. The player who lost the ball swaps in as a presser, and play restarts.