Picture 1: X1 passes the ball to O1, who passes it to O2. During this time X1 sprints to the opposite corner to play defense against O2. Emphasis is on a correct closeout. Depending on coaches preference either force O2 baseline, middle, or play them straight up.
Picture 2: After playing 1v1, X1 rotates behind O3, O2 rotates behind X2, O1 rotates behind O4.

Correct closeout technique, and 1v1 offensively and defensively from the corner.

The ball can start at a different line so the 1v1 ocurrs at the opposite corner or at the top of the key.

Correct closeout, and correct fan or funnel by defender, as well as boxing out and completing the play after a shot.