Liked this movie but... (Spoilers)
I like this movie, but in places it had some very bad writing and plot holes, such as
1. MacBride at the end says now we have two demons loose, this is a game changer. Are we really to believe the Warden was a demon even though he did nothing but help and he had blue eyes unlike the killers red eyes. Also he was concerned about Kyle when he was stabbed in the eye.
2. He was able to possess Johnny at the end, even though we had clearly seen two spirits enter McBride in the cemetery. If we are to give the writers the benefit of the doubt and say perhaps it was Johnny's spirit that had left his body and was fighting with the Warden and not the Killer. This is not the case as we see a flashback of him getting possessed in the car as they are driving away.