Trivia: The sorority mom, Andrea Martin, is also one of the girls in the original "Black Christmas". Her name in the original was Phyllis.

Black Christmas (2006)
1 trivia entry
Directed by: Glen Morgan
Starring: Mary Elizabeth Winstead, Michelle Trachtenberg, Lacey Chabert, Katie Cassidy
Visible crew/equipment: A boom mic is visible at the top of the screen in one of the alternate endings where a mortician comes to get the body of Billy from the coroner.
Melissa Kitt: I'm sorry, but that-that fuckin' voice, that was not Megan or Kyle. That was the fucking devil, and he was not talking to us, he was talking to Billy.
Question: Why would Agnes join Billy in his killing spree? She was a victim of him, losing an eye and her parents. She could've joined the sorority girls in stopping him.
Answer: Maybe like him she's also mentally ill, getting it from their mother. Maybe she feels doing this will bring them together.
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Answer: Because Agnes is in love with her fatherbrother, and besides, they were invading her home, from her perspective.
ChristmasJonesfan