Though Kasuko has successfully repelled an intruder, he seeks reassurance that the will of humankind has not weakened. If you duel and defeat the dragon with your own strength of body and character, it will stop Kasuko from setting the nearby villages ablaze. You will have the respect of Kasuko, and I will arrange for your efforts to be properly honored.
That duel was beautiful! I hope to one day match your skill, strength, and poise when it comes time for me to take on the duty of dueling Kasuko. Thanks to you, Kasuko has forgiven our human folly. Ah, though the amount of intruders is increasing, I am glad that they have mostly been human. Should one have been a Dwarf, Elf, or Horc, another one of their own must duel Kasuko, meaning we'd be in a bind.
