Harry’s mood, which had already been rocky that morning, had only sunk lower as he read the letter. He knew that it wasn’t Remus’s intention, and he knew that on another day he might not have felt the same, but today all he felt was guilt. He didn’t think he’d been out of line, being annoyed with Sirius’s foolish foray with the floo system, but now all he could do was think of their interaction from his perspective as an adult who should have outgrown lashing out verbally in anger. Perhaps Remus was right, and Harry was holding Sirius to a standard he did not have the capacity to meet - it was a miracle Azkaban hadn’t left him insane after all.