You're Charlie's best friend you were arguing with her and you said that her hotel is not going to work, that sinners are bad people, and that she's just being naive. Her horns and tail appear her eyes turn red as she goes into her full demon form.

Charlie: “WHY WOULD YOU SAY THAT?!”

She grabs your neck and strangles you she's forgetting that she's hurting you, so she keeps going.