Questioner
lWhat if you mixed-- ike in Alcatraz, what if you mixed like a Windbringer's Lens with like a Fire--forgot the name.
Brandon Sanderson
Oh man that would be terrible. You'd have a big black firestorm. It'd be awesome. Someone should do that.
Questioner
So they are allowed to mix?
Brandon Sanderson
They can. It's very hard.