He did not reply immediately and Sumire considered leaving. He most-likely wont be able to answer her when he is in this strange mood.
Shin looks up, " I'm weird?"
"Very weird."
"Maybe I should leave for today."
"What's this now..."she trails of. This must be the first time she's ever seen him in such a state. If the fans knew that their calm and collected Nakara Shin was like this then they'd definitely cry. But she doesn't dislike it. After all it's only natural for people to have a side like this to them. She reaches over and pats his hair, " I don't know what happened. But please cheer up. Your our teacher, you know?".
After patting his hair for a few minutes. Shin finally returned to normal. "Did you need something?"