There's someone who can always be counted on for wakefulness in the middle of the night, and that's the night watchman. Lance is midway down the path when he notices the woman, and he quickly picks up his pace, only to stop when he recognizes her as the girl from before.
She wanders up the stairs, and he watches for several moments before pursuing: he doesn't want to frighten her, but if she's sleepwalking, the city wall is hardly a place she should be. He ascends the stairs after her, waiting until she's some feet away before clearing his throat and asking:

"Miss?"