In the story the teacher knew the other students were against the problem student because they wrote about him in their journals and suggested ways to deal with him.
I started thinking of a system to get student feedback in quick and easy ways. The best one I thought of was texting or emailing a question to the students that they respond to. This could be great because you could ask all the students different questions. For example you could ask students what they thought of Student 12's behavior etc.
I think that as we teach we need to include feedback loops. We need to make it easy for students to tell us how we are doing, leading to better quicker learning by our improved teaching.