>>212736832The Jumping Man. We literally see her face superimposed on him. The Jumping Man to me is the physical representation of grief, stuck in constant turmoil and pain, reliving it forever. It destroyed Sarah's life and that is why this lodge spirit has attached himself to her. I don't think Sarah is an evil entity or being, but she's no longer good either, she's a husk.
Now that second part is obviously just my theory but the fact that her face is superimposed on him is not a theory they outright show you that.