You've turned the honorable nature of the Ninja Champion against her. You've declared that it would be dishonorable of her to disobey you after you have spared her life. In return, she has to fight in the CBT arena for the entertainment of the crowds. In an act of 'leniency', you've even allowed her to keep her sword, her adornments and her panties. How fair of a deal to a vanquished foe!
[Enslaved Ninja Champion will generate $50k profit monthly and trigger special CBT Events]