So... I might just be getting paranoid (seeing how J. K. Rowling doesn't mention the Dark Mark until the fourth book) but this curse conjures a green head. Morsmordre conjures a green head. They're both Dark Magic. Quirrell was being possessed by Voldemort, who created the Dark Mark. Is it possible this green head is actually the Dark Mark, or an earlier form thereof? -- 22:41, October 21, 2012 (UTC)