The brain hole is good, the protagonist travels back to save his good partner, and also knows his own life experience. But are you sure that this will not disturb time and space? The sentence "must die" may also explain this. The protagonist can save his partner. I think the reason is that his partner was not dead at that time, but was killed by Boris, a loser who crossed back and killed him, but it turned out that the end of breaking the rules was terrible: Boris lost his life . The director also feels that history cannot be changed...
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