“Arbor Demon” (*1/2 out of four) was a grueling horror thriller about a couple (Fiona Dourif and Kevin Ryan) who go on a camping trip to try and repair their damaged relationship; while out in the wilderness, they take in a wounded stranger (Jake Busey) and find that an unknown evil is taking out all nearby hunters and wildlife and they need to decipher whether the evil is real or in their minds. Passable beginning with shades of “The Blair Witch Project” and “Evil Dead 2” soon fizzles as film becomes muddled, pretentious, and dull.