The ball is passed by LB to LW and LB follows the direction of the pass a little bit of the way.
Now LB changes direction and runs slantwise against the center.
At the same time CR moves out and puts a screening on the defending R2, who normally will move out in order to try to stop the attacking LB.
LB attacks the defending R3 and passes the ball to the screening CR, who now can use the space behind the defending R2.