She, however, was growingly distracted by a sound that was echoing down the stairwell and getting louder every second. It was a human voice, repeating the same utterance, again and again, as if the speaker were an actor trying to memorize an elusive snatch of dialog. At the beginning she could only make out a few of the more percussive consonants, but as the speaker got closer, one flight at a time, she was able to piece the sounds together into words.