How Kirin Works

W/ Zetsu: "And what does that have to do with..."

B/ Zetsu: "He doesn't have to use his own chakra...
...But just take advantage of the enormous ambient atmospheric energy...

...To create a Lightning Style jutsu!"

W/ Zetsu: "Which one?"

B/ Zetsu: "Doesn't matter. Whichever one it is, it'll be on a totally different scale than what anyone else can create using change in chakra nature alone!"

B/ Zetsu: !
"I see...
So Sasuke deliberately lured Itachi outside so he could use the heat generated by the Amaterasu."
(Sfx: Zizzle) 

Sasuke: "This jutsu guides the lightning striking down from the heavens...

...In short, I merely direct it's power toward you."

B/ Zetsu: "Just as I thought... Which is why it cannot be evaded..."

W/ Zetsu: "Why not?!"

B/ Zetsu: "The speed of lightning is 1/1000 of a second... It's faster than sound!"