So I take my class outside today, and tell them I'll have them do two presentations, but each presentation will only be done with half the class. The other half of the class will be on the other side of the school yard doing independent work, about 20 feet away. I figure that way I won't be trying to get 20 or so kids focused on one group presenting while they're outside, but instead getting just half the class to focus. So I get the rowdier half of the class to pay attention while one group makes their presentation, and they do it fairly well, and then I go to the other half of the class to have them see one group do a presentation. But it's difficult to manage because the rowdier half of the class, despite being about twenty feet away, is making so much noise that it's hard to hear these presentations. So I go there and tell them they have to quiet down and the next time someone creates a distraction they get detention. One of them causes a distraction and I go there and give him detention. But then as I turn my back a few of them scream. I turn around and say if they scream again, I'll give all of them detention, but the truth is I don't want to do that, because I know only a few of them are actually doing it. So they scream again when I turn my back and honestly I don't know what to do- I can't punish them because I don't know who actually did it, but I don't want to just let it go. What would you do in that situation? Thanks for any help.