Okay,... In The Single-player game, In the Celestial Arc., When you are batlling Two of the hunters in the same room(after you beat all the hunters), go to one of the walls. Shoot it with the Judicator, Then the Magmaul, then the Battlehammer. Then right at the instant the last battlehammer shot hits,(you must have perfect timing) Walk into the wall. Ta-Da!