Angry Local Student

There was a room with some musical instruments inside in the dorm. Some of the residents could use the room for practice. One of the korean girl borrowed the room and let her local hong kong friends to use the room. At the same time, the Dorm wanted to get a movie activity in that room. When those people were in the room, I asked them left as the Dorm always had the first priority to use the room, even someone has been using it. These were four or five local students from other UG Dorm. They asked me if I would let them use the room at the other time slot, and I agreed with it. One of them were so mad when I told them to leave and  pointed his finger to me and yelled that if I would keep the word. That's the first time i got finger pointed. I was quite angry. but i didn't show it on my face. I acted so calm.