This was the person who convinced me demon possession was real. When I looked in her eyes, what was looking out at me wasn't human, but something feral, evil, and mocking.
I had a similar experience later with another library patron: same sense of a calculating, evil, non-human presence in the eyes.
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She started to say in a very female voice, “He’s coming”. Then she “changed”. I don’t know how else to describe it. Her voice became that of a mans.... Her throat and face changed appearance.
The throat and face changing when her voice changed makes perfect sense, because it's the shape of the mouth and throat that create a particular voice. That's why impressionists, when mimicking a particular personality, sometimes take on some of the facial features of that person: the shape of the face is part of imitating the voice.
It makes sense that a demon would be able to control the shape of the mouth and throat to a greater extent than any human impressionist.
It was the darndest thing I have ever witnessed. Now, working in hospital Security, we were “use” to fighting people on PCP, delusional etc... but not like this. A person on PCP is violent and extremely strong; however, the facial appearance, throat, voice etc... don’t change. What was startling to me was that this poor woman was highly educated. She was a research scientist at a local government hospital. From talking to one of the psych nurses later, the woman managed over the years to suppress “him” but was having difficulty at the moment and she admitted herself. It gave me an uneasy feeling then and it still does simply because I don’t understand it.