It turned out that there are supernatural factors in this film. I
can't say that the grandma stood up. The previous plot can be explained by reasoning.
At that time, I thought that the emotions of people outside the elevator could affect the people inside. Yes, so I suspected that young security guard, and it wasn't that he was telling stories all the time, and he also said that the solution or something, the
result was that the legend of ghosts and gods was inserted horizontally, and all the previous reasoning was completely disintegrated. PS. The diagram I saw may be different from the understanding of the movie
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