How did Thor know that his hammer would be placed back in time?
If taking Mjölnir from when they went into the past would of meant Thor wouldn't of been able to use in at all in "The Dark World" But since Captain America was able to bring it back and not disrupt the timeline, yet how did Thor know that Cap was worthy or even know they had to bring it back since it was only explained to Bruce/Hulk when he went back to retrieve the time stone?
Best Answer
I guess the simple answer to this is just... We're talking about Thor.
In the MCU he's a character that's always acting in a rather dynamic and direct way, just following his gut feelings. What's that? A bad guy!? Punch him in the face!
As such I can totally believe him just taking the opportunity without a second thought, following a typical "will figure out something later" kind of approach.
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Would an elevator go up if Thors hammer was in it?
Thor: If he can wield the hammer, he can keep the Mind Stone. It's safe with the Vision and these days, safe is in short supply. Steve Rogers: But if you put the hammer in an elevator... Tony Stark: It would still go up.How was Thor able to take Mjolnir from the past?
In Avengers: Endgame, Thor brings back Mjolnir (his hammer) from the past to his "future" self through the quantum tunnel. Later in the movie, Captain America gets hold of it being worthy.Did Thor know Steve could lift the hammer?
Afterwards, Thor admitted that while he had no idea what was really going on with Steve and Tony's current argument, he sided with Steve due to his ability to pick up the hammer. Cap nodded, rushed into a Quinjet, and flew off to go break Tony Stark's nose several times over.Thor gets his power back
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Answer 2
You missed the main point of the movie.
They took time to explain that this is not Back to the Future.
You can't change your own past.
By going back to the past, the team created 4 alternate timelines). Time is definitively changed in those timelines. (I hope the future "What if" show will explore some of those timelines).
You might be able to set the timeline on a very close track as before, by setting everything as it was before.
But it is impossible after the events of the movie. Everytime they went to the past, they broke something.
And you don't need to.
You don't need to undisrupt the timeline.
All you need to do is to bring back the infinity stones at the same moment. You don't even need to bring them back in the same place and giving them to the same people.
So it does not matter if Thor saw Cap bringing back the hammer, or if Cap put it discretly in some empty room while no one was watching.
This is a new timeline that will never be the same.
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