Board Thread:Theories and Speculation/@comment-1512913-20161119171442/@comment-1512913-20161119205810

Well, one nature in each hand is at least how Yamato explained it. Earth and Water used simultaneously and that's done by clasping hands and applying 2 different nature transformations to chakra at the same time, one with each hand. Haku and his 1 handed hand seals was something very unique after all. That's until Kishi decided later on that every single hand/arm amputee is suddenly going to know how to use them.

Originally I thought like most people that Dust Release is simply Fire+Earth+Wind. But now I believe it's actually Lava Release + something else for 2 reasons:
 * Kurotsuchi has Lava Release
 * if the 1 nature in each hand thing is indeed true, then having 2 hands, it's impossible to perform more than 2 nature transformations simultaneously, meaning the only way to mix 3 natures with 2 hands is if 3 natures get reduced to 2, by mixing them.