The Goth girl points at you menacingly, then says "You better watch what you say, or you'll be getting the same fate as Mr. Donaldson."
For a moment there, you feared that she would actually turn you into a girl, just like your teacher, but instead she's just giving you a warning. Thank god too, because you really don't want to become a sex-obsessed bimbo slut like your "new" math teacher.