The whole world should have a mainstream reality timeline, the current story takes place in July 2016
1. Each loop has an entrance and exit. Entering is the time of the day when the loop is repeated, and exiting is the real time. So Jake enters the loop from the cave, but if he doesn't pass through the cave, the whole world is always in the loop.
(Doubt: Does the destruction of the loop represent the disappearance of the loop, or does the entire 1943 loop disappear from the real timeline and create a separate timeline? If only the loop disappears, then Jake should be able to return to the 2016 reality after passing through the cave after the destruction of the 1943 loop. Time; if it represents the disappearance of the entire timeline, then there will be two independent timelines, the entrance and exit of the cave will also disappear, and the real timeline will no longer have jake?)
2. The loop should be independent in time and space, otherwise 1943 cannot go to the loop in January 2016
3. If the destruction of the loop will continue from that day, then the real world has multiple independent timelines
4. When you exit the loop, do you return to the mainstream real world or the relative real world? The 1943 Abilities entered the loop in January 2016, and came out in 1943, which is relative to their real world. So Jake will never be able to return to the original real world? The latest loop was established in January 2016 and has been destroyed, and he stayed in the extended time world after January 2016. So even if he enters another loop and then comes out, it will still be January 2016. How can he return to the original real world?
5. If time will continue after the loop is destroyed, then every time Jake crosses the loop, he persuades the bird to close the loop when he returns? Otherwise how would Jake be a soldier in the 1942 loop.
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