To start drill O (defenders) will move closer to the puck carrier (top player in line) and they will do a quick 1 touch to start the drill. X's attack 3 on 2 vs O's.
Can play it out or do quick attack (3-5 seconds) and blow whistle to signify change.
X's communicate (or coach identifies who is staying each time IE players 1 and 2 in line) and X's stay to play defense. Closes X to the O side goes towards the top player to do a 1 touch pass and this signifies the changeover. Now O's are attacking 3 on 2.