A more sensitive person might have added a 'please' to the end of their request, but Bran was completely indifferent to his bluntness. Even if someone had pointed it out to him, he would have dismissed them in an instant. Telling herself or a disembodied voice that she couldn't sing as well as she once could accomplished nothing except to ensure a poor performance.
The song choice could have been better, but he didn't allow himself to dwell on that. In the darkness of the vacant apartment, Bran closed his eyes and listened, every rise and fall of her voice absorbed into his memory. Criticism could come later, although he did note that she didn't sound quite as hesitant as she had before, particularly by the end.
Suddenly, whether anyone else in the building could sing didn't matter. There was raw potential here, and he'd be damned if he was going to let it remain in some kind of vocal limbo.
"Good. Thank you." Ah, yes - he'd agreed to leave, hadn't he? "And now I bid you farewell." She'd held up her end of the bargain, after all, which contented him for the time being. He slipped out of the apartment soundlessly, disappearing down the stairwell with only a brief glance backwards.