If you are watching the 1080p WEB-DL version, the cinematography—especially the grainy, "night-vision" security footage used toward the end—is designed to make you feel like an intruder in a ritual gone horribly wrong.
If you are watching the 1080p WEB-DL version, the cinematography—especially the grainy, "night-vision" security footage used toward the end—is designed to make you feel like an intruder in a ritual gone horribly wrong.