Key Points:
HEAD UP
Passing while moving
Defending 2 on 1
GETTING OPEN

Drill starts as 2-0, with D2 curling with puck behind net and passing to 1 of 2 curling forwards. They break up ice on 2-0 with the D2 following up behind.
Once that unit has finished. D1 curls behind net and makes a pass to 1 of 2 forwards curling going down 2 on 1 on D2 with D1 following up behind.

The drill starts again, repeat for continuous flow.