Micah: Basically, they're these malevolent evil spirits that only exist to cause pain and commit evil for their own amusement. It's pretty creepy. I mean, they stalk people for years, like decades, and sometimes they're really intelligent in the way they do things to freak you out.
The Psychic: You cannot run from this - it will follow you. It may lay dormant for years. Something may trigger it to become more active and it may over time reach out to communicate with you.
Katie: I feel it. I feel it breathing on me.
Answer: The screenwriter confirms in the commentary that burning the cross and picture was a mistake because it was the last defence they had.