He waited for her though he'd noticed the students moving to get out of the building. But there was no way that he was leaving Yotsuyu behind. Hendrik didn't make any comments as he waited either. He figured she would find some way to deal with the perpetrators, but that had to come from her in her own time.

But once they were outside, the knight looked over at Yotsuyu. "I take it you have no idea as to who the culprit might be?" Yes, they're going to have to answer to him, but that's going unsaid. And after a moment or two, he looked around and back to her. "Are all of your students present?"

If they're not, he's going back in for them.