Player 1: Stand near the red button and look straight ahead, in the distance you should notice a panel with a red arrow pointing down (near the water). Replace the portal from the dispenser here and stand by the red button now.
For the next few steps you need to be really quick if you're going to make it (it's easy to mess this up as you'll see if you watch our video). So initiate a countdown timer and as soon as it reaches '2', tell player 2 to start running and hit the red button to release the Displacement Cube into the portals. If you've timed it right, player 2 will catch the crate in mid-air as they hurtle towards the portal the Displacement Cube came out of.
Now you need to be especially quick here, once your colleague has caught the Cube, look down at the water for the two square panels. You want to place an exit portal on either of the two panels, this will cause player 2 to sail straight up to the red laser beam.