Do Not Let It Happen Again

I put them on teams. They are snarling like tigers. I listen to it, but do not comment. I give the first question. Two teams miss it and want me to repeat. I am the game show host. I have already told them to listen Because I will not repeat. The teacher repeats the question. I give her the teacher look. She begins apologizing. I tell her it is okay but “don’t let it happen again”. This is about as harsh as I get.