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Karma Houdini: The Thespian kills the Artist wife, tricks him into thinking he did it, and triggers a murderous rampage, and ends up winning the fight with the Artist If he wasn't a hallucination that is.
Mad Artist: The Artist. Complete nutter butter. See Sanity Slippage on this page.
Mercy Kill: Annabel kills The Artist during the climax of the story, to relieve him of his insanity spawned hallucinations.
What Have I Become??: "Lord forgive me.../...I'm a monster!" Subverted he doesn't become a monster. Just a psycho-killer.
Enemy Within: Subverted The Thespian leads The Artist to think that he killed Annabel, in turn causing The Artist to think he has an enemy within, but it turns out that The Thespian is a different person, but then in the ending it ultimately turns out that the whole thing is in his head, anyway.