The death of Sirius's smile was swift but not painless. Twelve years and he still hadn't lost some instincts. His body tensed when Remus's hand began to form the hex.

He didn't think they would go back to normal after Sirius convinced him of his innocence, but he thought they were past this. Had Remus taken a few weeks to process the news then decided he hated Sirius after all? No-- it was probably vanishing without a trace while waiting for the Dementor's Kiss. That had to be it.

"I didn't expect to be here either. I would've wrote you, but--" He spread his arms out to call attention to the situation. "I haven't found a way out of this mission we're on." Then, because an obsession was hard to drop, he asked in a harsher tone "Did you find him?"