Questioner
You talked about Mistborn being the space traveler ones. I was wondering if you were going to utilize some of the speed bending into that, into the travel with it?
Brandon Sanderson
You will see what I do when I do that... The biggest problem is, for you physics majors, how we make sure that we're not breaking causality... So breaking causality is kinda my big no-no. For instance, I have right now that moving between Oathgates goes at the speed of light. But technically we still break causality, right, with Shadesmar stuff... But the issue--the way we can do it in Shadesmar is because it breaks causality, but there is so muc-- Like if you were able to go into Shadesmar, move at the speed of light, come out like, you could break causality but it's, in practice, impossible, because the difference is so slight.
We also break causality with the Spiritual Realm, but I can control that.
Questioner
Also you can just kind of like, mulligan that off.
Brandon Sanderson
...If we were having instant speed, communication and things like that... yeah if we have an ansible, that's how we're not breaking causality. How we're not doing the train thought experiment which breaks my brain...
So that's the big thing I have to worry about once we get to the Mistborn era, the space travel and stuff. Like, right now I don't break causality, or at least if I do, it is indiscernible to human ability to realize it. Once we get to actual space travel, and actual FTL, then I want to have rules in place, even if it is just like the rule for red shifts. On speed bubbles, where I say, "Yeah it just doesn't happen." Letting you know. But it would be no fun. Even if it's just that. But I at least want to have that in hand.