Regardless of parallel universes, there is only one universe.
Make a simple model:
1. Draw a timeline.
2. Set a sequence of events from 1 to 9 that occurred before the explosion.
3. THE EXPLOSION IS "10".
4. The "now" where Doug, who was assigned to investigate the incident, is the beginning of the film, is "11".
5. At the end of the investigation, Doug traveled back to the past as "12".
The story goes like this:
(Assume that the delivery note reaches time point 2, resulting in a series of changes, which will be ignored for the time being)
Doug at 12 travels to time point 5, and changes from event 5 to event 10 (ambulance, fridge magnets, etc.), when he changes from event 5 to event 7, Doug at time point 11 The playback you see is the changed 5.6.7 and the unchanged 8.9.10.
Because the key event 10 (explosion) has not been changed at this time, Doug at 11 is still investigating and will not be affected in the future.
Until Doug, who went back to the past from 12, changed from 5 to 10 along the timeline in the past, the explosion was changed, and the heroine did not die! Doug's task was no longer to investigate the explosion, but to take notes.
Then Doug at 11, who was investigating the explosion, does not exist, nor does Doug who crossed from 12. The future is altered by the past and reverts to a timeline.
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