A Wasp Launcher is required for this trick. At the end of the level, where you turn the corner and confront Nikki, partially creep through the door. Do not go all the way or you will trigger the ending scene. Fire the Wasp Launcher so the projectiles will lock on to Nikki and she will run up out of the hallway. She is invincible, but will not attack Barry. Note: If you walk through the hall, you will end the level as normal.