The obvious first thought was, she is the one possessed, but then I thought, John likes his little twists, so what if it is not her (at least, maybe not anymore), it is him.

I know that demonic possession is easily diffused or spread from one person to another. Each time evil is manifested in a way we can see or feel, don't we carry that dark pain inside us like a thorny seed, allowing it to sometimes influence how we think?