They spot movement near the back door, where they'd already idly been looking (because no self-respecting investigator would just waltz right into the main entrance, right?), and hustle back there from the alleyway to try to stop whoever it is. The person they desperately hope isn't Natalia.

Ah, crap, they think when they realize that their worries exactly match reality. "You shouldn't be here," they say in that same practiced tone, thinking that disguising their voice and face will make it less immediately obvious. (And forgetting about the magic that would protect their identity anyway.) "If you want to play games that badly, you don't have to break in to do it."