Someone told the teachers, and she thinks it was you because she doesn't know who else would have known. She ended up in solitary confinement.

[He's willing to bet Rika doesn't know the details of that.]

They didn't like her before that comment. And did you ask to help her study in front of people she'd hate admitting weakness to? When you know perfectly well how hard it is for her to ask for help to begin with?