I would simply tell the DOS/TA to move his/her arse out of class, and if he/she does not comply, I would stop teaching immediately. And I would say that in Chinese in front of the class! Imagine the scandal, which they then rightly deserve. No chance for them as far as I am concerned!

I will pay to see you do that Turnoi, and I will bring a big box of buttered popcorn with me.