"I said something inadvisable to a demon, and the inadvisable thing I said seems to have given it some sort of power over me. Namely, the power to create a witch version of a friend of mine. You could be a perfectly benign witch version of her. You could also be a hostile entity who's also convincing facsimile of a benign witch version of her. Given the nature of the type of demon I suspect we're dealing with, I'm more inclined to believe the latter, but I'm not sure how to prove it either way."