The ball is passed to LB, who passes to CB.
The 2 defending players moves in pairs forward and cover CB.
The ball is returned to LB, who is running forward, and the defending players moves back to defend.
The ball is now passed to RB, who is running forward and the 2 defending players must - in pairs - move fast in order to cover RB's shot, which is taken after a 3-step approach.