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Finally saw this, pretty darn good horror film in it's own right, looking forward to a sequel.
My only real nitpicks were:
Spoiler...You can't fire a nailgun like that without bypassing the safety, they actually took the care to address this in I think it was Tucker & Dale vs. Evil where he held the safety mechanism back with one hand while he fired away with the other.
And then how Mia mysteriously had no burn injuries on her face any longer once she broke the possession and was revived.
Really enjoyed the movie overall, 8/10 for me.