Both ends at the same time.
-x1 just starts the drill here, skates in and takes a long shot on net
-after shot, x1 skates down below the circle and receives a drop pass from x2
-x1 makes pass to x2
-while this is going on x3 is timing it to be going up ice on the boards and be a good target to receive a pass before the blue line
-x2 makes a quick catch and release or one touch pass to x3
-x3 skates down and shots on the opposite end goalie and then continues as x1 to start the next group

Tags: Last pass needs to be received before player gets to the blue line., This is a flow drill so there are no whistles.