Get ontop!/On Bottom!
Go to the overshield. Then turn around and go through the teleporter. When you teleport turn around and sword cancel off of someone to get on top of the structure that the teleporter exit is in. Turn around and have someone sword cancel off of you to the ceilng. Then sword cancel off of him. Walk all the way back and sword cancel over the wall and through the floor. Walk towards the other guy on the other side of the wall. (You will go through the wall enough for your partner to sword cancel off of you to get up) Keep walking straight until you hit the invisable wall. Then walk right. You will fall ALL the way to the bottom of the level and live!