You are on the stairs, facing towards the wall. Turn around and move forward, now turn left and get down the stairs, now turn left and get down three more stairs, now move forward towards the edge of the pool, now move towards the small potted plant, which is under the mirror, now turn slightly right and move towards the sliding door which is in between the potted plants, now again turn slightly right and move towards the sliding door,  now you are standing in between the walls, this is your end point.