It was almost as though Remus could see the inner workings of Sirius' mind, and that was probably because he knew the other boy so well but also because Sirius wasn't exactly able to hide the tremendous grief he was feeling inside right now. To hear that his best friends had been murdered was horrible; to have to learn that he might have been responsible had to be traumatizing for Sirius. He gently tucked the glasses back into his bag for safe keeping, but he didn't think Sirius would have believed him if he hadn't seen them for himself.
The denial that immediately came out of Sirius' mouth was nothing Remus wouldn't have expected. Of course he wouldn't do it. Of course he'd die before he ever allowed any sort of harm to befall James or Lily, let alone wee Harry whom Remus had seen Sirius bond with before everything went to hell. That all made perfect sense, and it was exactly what Remus had told everyone who started throwing accusations about Sirius being guilty. That was logically the most sound defense; Sirius was loyal, almost to a fault, to those he cared for. His animagus form was a dog, for Merlin's sake. If that didn't scream loyalty, Remus didn't know what else would. But the cold hard facts were that a Fidelius charm had been cast; Sirius had been the Secret Keeper. No one else could know where James, Lily and Harry were.
And that was what Remus was going to drive himself to madness trying to understand.
"I know," he said. "I know that." He wiped his tears on the tattered sleeve of his cardigan. "I know you would never. I tried-- I tried to tell everyone I could that you couldn't possibly be responsible. But -- there's more. From what I was told, Pete went looking for you after it happened. He found you, tried to stop you until the Aurors arrived. There was an explosion. It killed twelve Muggles, a-and it killed Peter too. The explosion -- that's how the Aurors found you. They took you to Azkaban. There wasn't even a trial. I thought if there was, I could speak for you but they just took you there. I tried to come to you, to go to Azkaban to visit because I thought if I could just get to you, tell you everything I knew, that you could tell me what happened and we could figure it out. But they just kept denying me and eventually said maybe I should be thrown in a cell too because maybe I was your accomplice. I wouldn't have cared if they locked me up, but then no one would be able to figure out what really happened."