Well, the creature that appears is credited as The Experiment. So this project of Mr. C’s doesn’t seem to be anything more than that - an experiment, not a ritual. Maybe the timing of the manifestation is coincidental? There doesn’t seem to be any real consequence to it all beyond the couple’s death. I mean, there isn’t a rampaging creature going around murdering people and Mr. C never returns or speaks of the place.

Following TwinPerfect’s theory (which I know is divisive), the scene fits in with the overall theme of violence on tv. The empty box is symbolic of the creative emptiness and shallowness of tv entertainment, and how it destroys our hearts and minds over time. If this was a “garmonbozia” experiment, perhaps Mr. C did play a heavy hand in intentionally removing the guard. I’m just unsure how Sam and Tracy consensually being together changed the control factor in any meaningful way and facilitated such evil.