Originally Posted by
Akraen
I think you're attempting to apply real-world physics to this.
Any adjustment in a prior timeline changes the timeline. It's the only explanation beyond the Grandfather paradox. Any alteration of a present action on past events, while doable, simply creates (or already exists) on a different timeline.
If you try to step back and stop looking at time in a linear fashion, imagine everything has happened. It's easiest to do this if you go to what you imagine to be End Time because as humans it's too hard to conceptualize something beyond time. Anyway, consider spilling a glass of milk on a carpet. You spill it one way, milk splatters off into different directions. That's entropy in action. Can't put the milk back into the glass. In another timeline, you spilled the milk slightly differently, splattering into different directions. In another timeline, you didn't spill the milk. In another timeline, you didn't even have the milk.
Every permutation of every event possible exists on its own timeline. The very act of time travel is to cross into another timeline where the occurence "present you" is doing, or altering, is already part of that timeline.
It's as though each possibility, each reality is already calculated and on a channel. Via time travel you just switch channels.
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Ok Stephen Hawking stuff aside, you're asking if we just let the Infinite Dragonflight do its thing and change the past, how would it work?
It wouldn't. If you apply the closest thing to an understanding for what modern physicists have about time, we could have just let the infinites kill Medivh, because there's a timeline where the dragons forgot to show up, and that must be the one we were in. In other words, you can't modify the timeline you're on, you can only move to different timelines.
This is fun to think about, because there's also a timeline/universe where the Infinite Dragons succeeded. Blizzard could explain this way by stating "magic" - and I would suggest they do.
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I am sure in developer/lorewriter minds, there is a distinction between modifying past, rewriting history in all timelines, or using magic to alter our own timeline (Warcraft Universe doesn't have to follow our physics rules in real life). Infinite Dragonflight are probably on the magic side, Garrosh is doing what Walter Bishop did.