After watching the third episode of Harry Potter "Harry Potter and the Prisoner of Azkaban", I thought this time converter is too abnormal. If there is any disaster in the future, I take out the time converter and call back to time. Just do it again. In episode 4, Cedric died in "Harry Potter and the Goblet of Fire", but why didn't Dumbledore use the time converter?
After reading the answers on Quora, I suddenly realized that, in simple terms, time converters can’t actually change the past. The Porter 3-man action team thought that going back to the past saved Buckbeak and changed the course of history. But Buckbeak changed the course of history. There was no death at all, because the clones of the 3-member action team saved it. Dumbledore knew that Buckbeak was not dead, and he reasoned that a time converter would have to be used to make this possible. In fact, in the process of rescuing Buckbeak, Dumbledore deliberately or unconsciously played a cover for the 3-man action team. Perhaps Dumbledore had long thought of this as a user case using a time converter.
The very important point here is that the 3-person action team thinks that Buckbeak is dead. If they know that Buckbeak is not dead, then they have no reason to use the time converter to go back in time. If they don’t go back to the past, Buckbeak It will die, and a time paradox will occur, which will lead to a catastrophe.
In "Harry Potter and the Goblet of Fire", Cedric really died. Even if you go back to the past, you can't change this fact. If you change it forcibly, it will of course lead to a catastrophe.
This theory can barely explain all the plots in the story, and can basically justify itself, but if it is more truthful, it still cannot withstand careful scrutiny. For example, what is the causal relationship between Buckbeak’s rescue and the use of the time converter? Was Buckbeak rescued because he used the time converter, or did he decide to use the time converter because he saw that Buckbeak was not dead? This seems to be trapped in an infinite loop of "the chicken or the egg first".
There are many works about time travel, most of which are full of loopholes. It is completely acceptable to me that the author can compile the story for this.
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