When I was a child, my mother would tell me a story about how the Devil roams the Earth. Sometimes, she said, he would take human form so he could punish the damned on Earth before claiming their souls. The ones he chose would be gathered together and tortured as he hid amongst them, pretending to be one of them.
When I was a child my mother would tell me stories of demons. Sometimes demons will incarnate human beings, and before reaping cursed souls, he will punish them. Those who are chosen will be brought together. He would hide in them, pretend he was one of them, and torture them.
Therefore, this sentence directly tells us that one of the five people in the elevator is the incarnation of the devil. Then there is a detail that the director deliberately revealed at the beginning, that is, the black security guard complained that the old lady's chili water expired in 1987. This shows that the old lady died before 1987, so the old lady is the embodiment of the devil.
Now that the killer has been identified, there is nothing left to doubt.
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