Harsfin swept his gaze over the four of them and said, "You don't need to be so tense, I'm not going to run. Ah, to be honest, I'm quite fed up with the Demon Realm and would rather explore the human world. So, how about we negotiate some terms?"
Ah Dai froze, and replied, "Terms? What terms?"
Harsfin proposed, "These terms are very beneficial for you. As long as you can defeat me in a one-on-one duel, I will join the human camp and help you deal with the Bone Dragon, Nazgul, and Harbank. How does that sound? Of course, after this is over, you need to take me along and show me the human world. I promise to refrain from causing random slaughter."
Ah Dai was pleased with the answer and glanced at the other three Sword Saints, asking, "How can I believe that you're telling the truth?"
Harsfin solemnly replied, "That's easy. I can swear an oath! I, Harsfin the Terrifying Demon, hereby swear that if you, boy, can indeed beat me, I will let you command me. Is that good enough?"