A recess in the entrance's alcove offers the perfect hiding place to hear the patrol route of the guard in the next room. There are plenty of shadows in this part of the dungeon, but you will still need to be careful.
As the guard moves past you, his torchlight illuminates a door directly ahead of your position. Once he moves out of sight, you again listen closely to his footsteps and try to decipher his pattern of movement.
You hear the sound of a door opening and closing followed by footsteps on a set of stairs. Then, the familiar ring of the watch bell. His footsteps now more distant, you hear a second door open and close. Finally, quick footsteps take him on another set of stairs. A few moments later, his torch approaches once again.