He was sure her existence would have been a lot less complicated without a Phantom living in the building, because it was no secret that the Lloyd Webber romance between Erik and Christine didn't actually exist. Still, he really would try not to draw attention to himself, although how much his counterpart would contribute to that effort remained to be seen. He didn't say anything in response, offering a weak shrug instead.
The way she looked at him - particularly the scarred side of his face - made him shift uneasily, and he barely had enough time to think before she was hugging him. Bran's surprise was paralyzing, allowing him to do nothing but stand there numbly until it finally sunk in; but by that time Lotte had already pulled away. "You're welcome," he managed, following her to the door. "I... I will." He offered an awkward smile before leaving, making sure the coast was clear before disappearing down the staircase.