[While Tsuzuki talks, Joshua stands off to the side, listening in on the conversation. Their general invisibility is a blessing, since he doubts any "students" would be allowed in here, but inside like this he can see exactly who is paying attention and who he needs to tune in to.

Tsuzuki can handle the verbal answers just fine, but Joshua is listening for the mental responses. Not only the teacher that's speaking, but a nearby teacher that has also noticed the conversation and is simply listening in. The teachers had been extremely disapproving of the principal even taking the position, it seems... And he really can't agree with what it seems the principal was trying to do. Academics are all well and good, but not giving creative outlets is a terrible idea. Maybe he's just biased.]

I bet the principal caused the illness to keep the teachers from fighting his decisions. Ask about the students that didn't enroll. Have they all returned?