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By definition, actors are detached from their jobs. They're like chameleons who can transform into another person during work hours, then shrug that person off like a sweater at the end of the day. But not always.
Sometimes playing a role will mess an actor up so completely that they're never quite the same again. They're not necessarily better or worse. They're just ... different. Permanently.
Welcome to Monsters 101. No sharpening wooden stakes in class.