A clatter of cans.
Steph turned to the office door.
"It came from the stairway..." Steph muttered pumping her shotgun as she slid some extra shells in her pocket.
Steph slowly went to the door and quickly exited into the stairway, the clatter had come from a few floors down. The zombies from before where not attacking the make shift barricade on the stairs and must have walked off into some of the offices. Steph went back and grabbed her cricket bat then, slowly, began to make her way down the stairs. 
"Probably just some corpses....." She muttered reassuringly to herself.