Kurenai: I did use a sealing jutsu on her. I took away my own students power.
Naruto: I don't get it, how could you do that?
Kurenai: It all happened a little over a year ago. With my own hands, I crushed her dream of becoming a shinobi. Up until then, I had been giving her one-on-one training...to unlock her hidden genjutsu.
Naruto: You're kidding me?!
Kurenai: But I failed her. I can't be trusted with the lives of the Squad Eight ninja.
Naruto: But why did you do it?
Kurenai: This discussion is over.