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** The Sun Warriors and the Dragons highlight that firebending is mainly about manipulation of energy. That it takes the form of heat and light, fire, is simply a matter that this is the most common form a human would know and the method the dragons mastered before teaching it to the firebenders. Iroh describes generating lightning as separating positive and negative energies within one's self not unlike a magnet or battery. This creates an imbalance then allowing them to come back together creates a very specific flow of energy, directed outward this becomes lightning.
