The old nickname still caught Sirius off guard. Remus tried to use it less, he knew it brought back James, or at least the memories of James he had been able to cling to. The true James of his memory, aside from the one Remus had taught him, the stories remembered through different eyes, regaled so he had something to tell Harry. The name Padfoot brought him right back to the state of loss, the feeling he got when his world collapsed as he walked into Godrics Hollow that night. The sight of his best friend collapsed on the stairs, the blood trickling down his forehead from the fall. It reminds him of the bad times, as they were the only times those things had let him replay. 