Kahn had always been quite curious about why Azula's flames were blue, but a long period of research had yielded nothing, once leading him to believe that this truly was a special talent unique to her.
Only after he learned Spiritbending did his research gradually take a turn, and the most crucial step actually came from a conversation with Iroh.
A Firebender's flames were the fire of the heart, flames fueled by their own will, emotions, disposition, and so on. That was how it should have worked, at least.
But when Iroh's grandfather launched his "dragon hunts," someone had also modified the original Firebending. Firebending, which had originally used all emotions as fuel, had been redesigned to favor negative emotions instead.
Firebending driven by anger, hatred, and jealousy was far more powerful than normal Firebending, and fire had gradually become a symbol of destruction.
Before that, however, fire had represented energy and life.
After learning the history of Firebending's transformation, Kahn had formed a new hypothesis about Azula's Blue Fire, namely-
Azula's flames were the ultimate expression of this modern form of Firebending.
Although he was reluctant to describe Azula that way, he had to admit that her personality was indeed more extreme and more unhinged than most people's.
Though he had corrected her personality somewhat over the years, the madness rooted in her nature had remained unchanged. She had merely learned to rein it in around those close to her, willing to play the part of a normal person for the people she cared about.
Because the emotions in Azula's heart were far more extreme and pure than most people's, they were perfectly suited to modern Firebending, creating her unique Blue Fire.
Precisely for that reason, by ordinary reasoning, Azula's Blue Fire truly was a miracle that could not