Thread:Elledy92/@comment-26838855-20190425183005/@comment-25521424-20190426085814

"If I give up the Time Stone to help your reality I'm dooming my own." "With all due respect, alright, I - I'm not sure the science really supports that." ''"The Infinity Stones create what you experience as the flow of time. Remove one of the stones and that flow splits. Now this may benefit your reality, but my new one, not so much. In this new branch of reality, without our chief weapon against the forces of darkness, our world would be overrun, millions will suffer. So tell me doctor, can your science prevent all that?" "No... we can erase it. Because once we're done with the stones, we can return each one to its own timeline at the moment it was taken, so chronologically, in that reality, it never left."''

This part is really important and i'm glad you pointed it out. What i'm more focused on is that, no matter what subject they are talking about, Banner and the Ancient One specifically talked of their own time periods as different realities. One cannot affect the other. So yeah, removing an Infinity Stones can affect the timeline of the Ancient One and create a possible a terrible future for their own, but returning back does not mean that the Ancient One's past reality will become Banner's future reality. They might have a similar course, but they are still separate, specifically because, according to the Ancient One, the flux of time is create by their own version of the Stones.