Let's go back to the beginning of the movie. The male protagonist cuts his head with a machete. It's like cutting a melon. One of the scenes still cuts three heads across the board - of course there is a lot of exaggeration in it. But how much effort does it take to cut off a person's head with one knife?
Most of the human neck is soft tissue, but the cervical spine is a solid bone, and it is said that every segment of the vertebra is fitted so tightly that it is difficult to find even a gap. The vertebrae, it seems that it is almost impossible for ordinary people to decapitate.
However, it is said that there is a stripe on the neck of a person, and it is easier to cut off the head according to this stripe. The ancient gangsters were well versed in this way, and they often looked at the necks of passers-by when walking on the street. I reckon that the stripe may correspond to the gap between the two cervical vertebrae, and the professional can make the knife sweep through the gap with precision, which is obviously much easier.
There is almost no relevant information on the Internet, probably due to the lack of a large number of "experimental" data. Our profession has nothing to do with medicine, and if you ask others, you will probably be regarded as mentally ill, so you can only guess at random.
If you know, please let me know.
PS: In the movie, Michelle Rodriguez, who plays the representative of the underground network, Luz, and Jessica Alba, who plays the female immigration agent Satana, are very dazzling bright colors in it. The former played a helicopter pilot in "Avatar", and the latter played Nancy in "Sin City", which is even more charming. Both of them belong to the typical cold and beautiful.
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