Ed Warren: Come on, Bill. You're not a psychiatrist, and we're not here to talk about my father. What do you say we get down to business?
Anita Gregory: Last year I was conned by a Welsh family pretending to be possessed by demons. And honestly, I don't know what was worse: the demons or the people who prey on our willingness to believe in them.
Lorraine Warren: The demons... are worse.
Lorraine Warren: Do you know when the voice is going to speak?
Janet Hodgson: Sometimes.
Lorraine Warren: And when it does, does it feel like it is coming from inside of you?
Janet Hodgson: No, it is more like it is coming from behind me, like I'm being used.
Lorraine Warren: Ed, this is as close to hell as I ever want to get.
Answer: Valak was portrayed as a particularly powerful demon. In horror films demons are often portrayed as overconfident, and in this case it was thinking that Lorraine Warren would not be powerful enough to be able to defeat it. In addition, Valak revealed their name while Lorraine was in a dreamlike trance state, so it may have believed that she might not remember or make the connection at any point and be able to use it to her advantage.
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