Hei Kaiser obviously smoked and drank, but why did he tell the doctor and Vivian to quit? Saying that you don’t need a dog, why did you buy it again?
When Black Caesar saw the doctor, there was a metal piece in his body, which was not removed in the end. Because I watched a bit of spoiler video, I thought that the metal piece in the body was used to open the handcuffs last. I didn't realize that it was the case until I saw the knife break.
This gave me an inspiration. If the fat man's knife and pliers just scratched to the wound, if the metal sheet in the body is just the required shape, then this idea can also be realized.
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