Rinna snapped back to attention when her arm was wrenched away from the blade. Instead of letting him get it behind her back though, she allowed the movement to spin her around to face him, a cheeky smile on her face. 

"Why shouldn't I know who Urufu's Kasai is? I'm his last living descendant, hence why the sheath to his sword is on my belt, and his wife's weapons lie on my hips." She paused for a moment, frowning at her trapped hand. His hands were very large compared to her own, so there was no gap for her to slip her wrist out of. 

"The sword was calling to me, otherwise I wouldn't have bothered coming here. Technically, that sword should have been part of my birthright, except it's been lost to my family for generations." She wasn't the least bit phased by his threat of taking her to the headmaster. It wasn't the first time she had heard those words, and it was likely it wouldn't be the last either. Besides, if she had gleaned anything from her meeting with the headmaster the day before, he would be far more interested in hearing about how following the resonance had led her to the sword, and how she had managed to see its aura.