Harry put his hand on Hermione's shoulder, stopping her from grabbing her wand to defend herself. "Don't Hermione, he's not worth it. He won't change, and it's best to just let it go, for now. We won't be students forever, after all."Later that night, he pulled Ron aside and, after casting a privacy charm around his bed, said, "Don't bother with any more pranks on Snape, he's not going to change. I saw his arm during detention tonight, and he's got the Dark Mark! I am not going to allow a marked Death Eater to live, not when I can do something about it. It was people like him that supported the fucker who killed my parents, and stuck me with my relatives! If killing scum like him will prevent another Dark Lord arising, and turning more kids into orphans, then it's "bye-bye scum!" And, if Voldemort manages to come back, I'm going to make it my business to make him pay for what he had done! For my parents, and every other kid he orphaned, I will send him straight to hell!"