I was wondering about that too, and why it suddenly disappears when ZYL appears.

I guess we'll find out? :D

I do wonder what ZYL makes of SW's (non-)reaction to everything that's going on! We hear absolutely nothing about that.

Good point! Shen Wei is being so matter-of-fact about everything (except the sex doll moaning ;-p) -- surely that should raise eyebrows. Otoh, maybe everyone just assumes he's suppressing his reactions so he doesn't scare the students?