Kari set up the room with dummies all over the room. She had this set up so they could practice the dark arts spells they had learned.
She placed a voice automated sound that would describe
"I would like the class the lesson.to review all of the things that you have learn so far, whether at home or schooling I expect you to use the spells on the dummies and not on each other."
"Next I want you to discuss what you are doing with each other and help each other learn things you are doing wrong. Any idle chat and points will be deducted."