User blog comment:Halo1081/Chapter 128 and forward/@comment-4911196-20150302030909/@comment-25993554-20150302034337

The fact that she didn't bother to even look at her (former) classmates, not even while leaving, worries me.

Nagisa might indeed be asked with the task of dealing with her, but she could see him as a complete stranger, given that she has no need for "Kayano" anymore. Talking might be useless.

And not to mention she nearly offed Koro. Nagisa is a great hitman, as long as his opponent is human, and has weaker bloodlust than him. He loses on both counts against her. If he uses the wrong words, things will get tragic.

Koro never retaliates against them, for obvious reasons. The one time an opponent actually attacked the class, they got severely beaten and were captured with ease. At the end of the day, they are still humans.