This film uses time and space travel and parallel time and space to tell the story of Potter's rescue of Sirius in the second half of the film.
However, when there was no parallel time and space for the first time, we called it Timeline A, Harry Potter and Hermione, and Ron and the three defended Buckbeak (Gryphon) with Hagrid. At this time, the stone flying outside the window broke the porcelain vase and hit the back of Potter's head. Parallel space-time already exists here (parallel space-time is called A+). This stone is made by Hermione and Potter who traveled through time and space (the timeline of Hermione and Potter who came through time and space was B and threw the stone to himself in timeline A). They used this stone to remind several people in Hagrid’s house, the principal The people from the Ministry of Magic and the torturer came. Potter and the three of them could not be found, so they escaped from Hagrid’s house and hid behind the pumpkin outside. Here, Hermione in the A timeline saw it in the jungle behind him. .... Here, when the timeline B does not appear, the film does not talk about it. In fact, the Hermione in A saw Hermione in the B timeline. Here again, there is Parallel Space-Time A+.
The last Sirius in the A timeline is not alive. Then Sirius both died at the time of A and A+. While watching Hermione and Potter from the perspective of B, they in B rescued them in A. That is to say, Sirius was rescued in timeline B after crossing.
So when Hermione and Potter in A existed at the same time as Hermione and Potter in B (this time has been proved by A+ time in the movie Parallel Time), how could Sirius in Timeline A die? Unless they failed once in timeline B... but this point of the movie is completely unexplained.
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