Everybody knows Sanji, martial arts black leg and his move Diable Jambe. In the pre time skip era whilst fighting against Jabra and Oars he spins really fast to burn his feet. But post time skip, (perfect example is him fighting against Luffy.) he just puts his legs up and it just burns. I don't have the mangas after the timeskip so I dont know if they explain it in the manga. And if they tell it in the anime, i dont remember it(probably wasnt paying much attention.) How does he do this? I dunno and if you know pls tell me.