Also, with all these theories about Harry going back to when his parents died, remember that in the book you had to turn the Time Turner 1 time ever hour, ok, so that is 16 yrs, 365 days in each, so 5840 days, 24 hours in a day, so 5840 x 24 = 140160 turns of the time turner....sounds like a LONG book if that theory is true LMAO
if it were possible albus would forbid it as it may make too drastic a change to the future if he did, i dont care how jk does it but she has to find a way to bring sirius back, though it would be cool if he used a time turner to go back and stop bellatrix and the others from escaping azkaban and joining the mission that night
But, If the Time Turner were used, then the present would already be the way that Harry would change it to...if that makes sense to anyone else, please, let me know....lol. But seriously, if Sirius were brought back, then in the present of HP's world he would be alive, because the changing of time would already have happened, AND then the present HP wouldnt go back to save Sirius because he is already alive, which would cause a rip in the space-time continuem and end all life as we know it...of course, THIS is why time travel is impossible because there are so many variables that have an outcome of devastating preportions....
I think here is the most powerful argument to this.
If Harry, at some point in the future, goes back and decides to save Sirius. That would mean that Sirius wouldn't have died in the first place. Because the fact that we witnessed Sirius die means that he wouldn't have been saved.
Basically. The fact that Sirius died, means that anyone's going back to stop it is not in the cards.
Got that?