A substitute teacher came in and subbed for one of the first-grade classrooms. We had an active assailant drill where we were told that it was a closed campus situation and that we could continue instruction but were not allowed to leave the building. I walked by the classroom and noticed that the sub had the class up against the wall and the lights off. I went up to her and calmly and nicely explained that since it was a closed campus situation, we could continue with the instruction. Still, the sub told me in a rather rude tone that no one told her that was the case and that if they wanted it done a certain way then they need to inform her, but until then she would be doing things her way. Any thoughts or tips?