Magnus and Tony
"The school is safe from outsiders, for the most part." That didn't mean that the students with the same beliefs could be kept out. Some of them most certainly were in the school and would try to bring others to their way of thinking. From what he had seen at least his son hadn't been brought into that. He seemed too reasonable for that.
"We just always have to be prepared." Because if it wasn't a one time thing there would be a lot of conflict even within the school and so that would be a problem.