Under normal circumstances, she would have been too scared to say anything to him. She knew he probably did not have good thoughts about her after learning about the things she had been doing in school.
However, this was a special situation.
She needed to stand up to him, even if he was angry with her.
She pushed her insecurities away and looked at him stubbornly as he continued watching the empty hallway after Teacher Shio disappeared.
His focus scared her because she knew how powerful he was in Tokyo. But she would never allow anything to happen to Teacher Shio. She would protect her because her class teacher was the only adult who seemed to care about her from the bottom of her heart.