Right now you're facing towards a wall. Now turn left and exit the room through the open door which is in front of you, move a bit forward and turn left. There is an arch in front of you, move towards the arch, there are three steps in front of you, get down the steps and turn left. There is an open door in front of you, move towards the door and exit the room. Now you are standing at the entrance of a walkway and it is your end point.