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THE REASON WHY NATSU AND GAJEEL COULDNT PASS TRUE FREED'S ENCHANTMENT
IN THE MANGA: IN THE CHAPTER 400 IGNEEL (AND PROBABLY THE OTHER DRAGONS) WERE REVEALED TO BE INSIDE THERE RESPECTIVE CHILDREN/DRAGON SLAYER. IGNEEL WAS INSIDE NATSU AND IGNEEL WENT OUT OF HIM TO BATTLE ACNOLOGIA.
NOW REMEMBER THE FIGHTING FESTIVAL ARC AND NATSU AND GAJEEL COULDNT PASS TRUE FREED'S ENCHANTMENT IT'S BECAUSE THEIR DRAGONS WERE INSIDE THEM. WELL HIRO IS ONE SMART MAN...