Question: *Spoiler* After Tony died, why didn't anyone just use the time stone to bring him back? We saw Thanos do this with Vision in Infinity War so not sure what was stopping anyone from doing the same.
Quantom X
19th Jun 2019
Avengers: Endgame (2019)
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Answer: Vision was killed by Wanda, and Thanos just rewound that "bubble" of time so he was alive. Tony on the other hand was killed due to his internal injuries, caused by using the gauntlet. Rewind time to just before he died, and he'd still die again, because of the damage. Rewind it to before he even used the gauntlet...and he wouldn't have used the gauntlet, leaving Thanos and his army alive and kicking. That's of course assuming that the time stone can even alter events which have been caused by all 6 stones combined.
Jon Sandys ★
I have a further to this question however. The keeper of the Time Stone is Dr. Strange, and has been shown to have adept knowledge in it's usage since he first acquired it. They do have to return the stones back to the timelines where they originally got them to keep the time lines from really getting screwed up, meaning the stones in their time would still have been destroyed by Thanos 5 years prior. However, what exactly would keep Dr. Strange, someone that powerful and knowledgeable of the Time Stone, from using it to reverse Tony at that point? As demonstrated in his solo movie, he can manipulate time around a single object... i.e. the apple he makes rot/eaten/and whole again without affecting anything else around it. So why can he not do the same for Tony, unless undoing that would make it so he never snapped, but that would only be in that little bubble like you said. It could create a paradox possibly, but this question brings up this issue as well.
Quantom X ★
The snap caused his death. If he reverses time, he dies again. If he goes back further, he undoes the snap. There isn't a little bubble. The time stone can't be that powerful to undo the ramifications of the snap.