When I watched it for the first time, I felt very enjoyable. The plot was compact and interlocking. At that time, I felt that there were many details that were not grasped. Looking back after reading a few reviews, there are really a lot of missing clues. Personally, I think there is roughly the existence of 4 layers of space.
To put it simply, the first layer has no specific display, but is reflected by some hints of the same plots later. It should be said that this layer is the result of the natural development at the beginning. At that time, the male protagonist intervened in the investigation for the first time, and then discovered the folding space, and the death of the male protagonist's partner was only killed because he accidentally encountered a criminal on the way back from the office. This is the cause of the heroine's death, and there is no future intervening factor. The second layer is still not fully reflected. At this time, the male protagonist crosses for the first time, but it does not prevent the success. The female protagonist is killed and the explosion is completed. Personally, I think it may be because the male protagonist rescued the female protagonist and went back to his room to deal with the wound, thinking that she would not be allowed to return to the dock to be dumped, so he left her at home and was still killed by the criminals who came to the door later. The partner of the male protagonist in this layer should have been killed because of the reminder of the note.
Most of the film is actually showing the follow-up development of the second floor space due to the intervention of the male protagonist. In the male protagonist investigation series that followed, he entered the female protagonist's room and found letters, pistols, and blood bandages (these all imply that the male protagonist had returned), but for other reasons, the female protagonist was still killed and the explosion was successful. However, he discovered the secret of spatiotemporal surveillance and caught the criminal. But because of the strong belief in going back to rescue the heroine, he decided to travel by himself, and then entered the third layer of space (in fact, he has traveled for the second time, which also implies some kind of deja vu. Including colleagues said that his fingerprints were everywhere in the room , the previous close-up with gloves has shown that it is not left this time). In it, the appearance of letters, pistols, bandages, and messages also indirectly reflects the situation of the second layer, and the third layer developed here is completely consistent with the situation at that time. But why the heroine was still killed after the first time crossing, the hero thought that maybe he left her at home at this time, and the criminal came back and killed her, so this time he took her away together. After that, the plot completely showed the result of this layer, preventing the explosion, the heroine was rescued, and the hero died. In the ending, the heroine survived, and the male protagonist still appeared at the dock as scheduled. This is the same as the connection between the second and third floors in the title, but it is actually the connection between the third and fourth floors. To sum up, each time the male protagonist crosses with the memory of the last time, but because of the disruption of what happened in the past, only his death can lead to the end of his time and space line, and the new time line begins, and he can start again. appear.
In general, I personally think that it is better than Inception, like the Pearl of the Sea. It is a good movie that has been missed by many people. On the theoretical basis of believing that there are indeed parallel spaces and time-space tunnels, if a person wants to go back to the past to change the existing facts, he must sacrifice a part of the existing one, such as his past self. In the film, the chase scene in which the criminal is tracked and compared between the past and the reality is a classic and impressive. I originally went to see James caviezel, but it was still very exciting with few scenes, and it also made people see Denzel Washington's excellent performance.
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