It contains spoilers to say that there are bugs in the film. Actually, you should not watch it carefully. Most people say that it is unreasonable to cut a leg without reaching the mobile phone. But another way of thinking is that if the doctor hadn’t cut off his leg, he would not have been able to escape the toilet. He would have cut his leg. Provide yourself with a lifeline
Why didn't zep kill the mother and daughter? This is a real bug. The possible explanation is that zep was so embarrassed that he decided to kill him because he wasn't sure if the doctor would be able to escape successfully.
There are some other places I think about it, it seems that I can connect it, or I admire the brains of the screenwriter.
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