As Zuko travelled around the Earth Kingdom with Iroh, his uncle taught him more advanced firebending techniques, including how to redirect lightning. Over time, Zuko was able to develop in this technique, eventually using it to redirect a bolt of lightning from his father, Fire Lord Ozai. He also used the technique against his sister, Azula, to protect Katara, though due to an improper stance he was unable to redirect the lightning properly, causing serious injury.