If you folks will recall, the first time that Luffy fought Kaido, he didn’t leave a scratch on him and got thrown in Udon Prison. However, this led Luffy to discover that he can level up his Haki to let him hurt foes without even touching them. He trained his butt off to learn how to use his Haki like that, and it looks like it paid off. But it’s only now that we see the true extent of his power! Luffy finally takes his Haki to the next level, and it is glorious!