Walk out of the bathroom and go out of the door on the right walk straight towards the window. Go down the first flight of stairs on the left and wait on the landing.
Exit the bathroom and turn right. Walk straight and head down the stairs on the left. Stop at the bottom of the stairs near the window.
Turn around until you are facing the theater room, about 180 degrees, then head straight until you reach a door on the right. Go through the door, turn left, and go straight until you see stairs on your left. Go down the first flight of stairs.