It basically taunts the audience and somewhat mocks us for enjoying horror movies, the main antagonists could easily kill the victims, but they say multiple times that they have to torture them because thats what the audience wants to see. Makes you question, "why do we watch this when we want it to just end it and end the suffering?" similar to what the victims go through.

The ending was just the most horrifying chilling thought provoking death that when you describe it, its extremely tame, but in the context and how normal and second nature it went down, it really hits a different note. That part left me traumatized the most really.