21 is an objective number that is beyond doubt, but I personally think that the "bridge" is not only the real lock-down killer in the film, but also represents moving from one side to the other, connecting different sides of the strait. There are two kinds of people on the bridge. s Choice.
In the photo, the choice of the police in the 85th sub-bureau, the choice of the protagonist, and the choices of all people are like being in the same river, but going to opposite banks.
Before the train drives, the protagonist and the kidnappers look at each other. In that shot, there is also a feeling of "I and you are on both sides of the river".
All in all, I think it is meaningful to choose the image of "bridge" _(:з"∠)_
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