when playing in heroic mode going into the control room at the top of the pyramid structure ...take the banshee right up against the door before you open it and hover upwards with the nose right against the door. when you get to the top of the door and the nose is against the top frame of the door, the door dissappears and you can get a head start killing the grunts with the banshee. Dont know if it works at any other doors yet I just discovered it last night.
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