I took you on as an apprentice, and you've now surpassed me! The only way to retain my honor is to face you in combat! Have at you!
You...spared me? No! I cannot live with this disgrace! If you will not grant me an honorable death, I will seek greater challenges to test my steel against! You've gone from apprentice to rival, and I will never give up until I have again surpassed you!