Disciline in the classroom

I had to discipline a student for the first time in the clss on Friday.  I was working with a third grade special ed. student on a book report covering the first 5 chapters she had read.  This student had coclear inplants within the lasst three years and has learned to talk and is hearing.  she is a very small child and before this past year she was extremely shy and would cry easily whenever something happened in the class, even when it did not directly effect her.  This was during  the last hour of school during the study hall period of the day and two 6th grade girls came into the room.  Each girl was 5'10" tall and weighed 180 plus pounds, was very loud and boisterous thus disturbing the entire class.  The main teacher was not taaking control of the room but one of the girls decided that she was going to take over my job and work on tutoring this young girl.  We had worked together for over a half and hour and was close to finishing the homework so the girl would have the weekend off without school work to do.  I had spent the week working on gaining the trust of this girl and we were suddenly interupted.  After several minutes of waiting for the head teacher in the room to say something to the older girl without any luck, I reached across the table, grabbed the paper that the older girl was writing on and removed all the answers she had placed on it.  She had started to protest by saying something about what the teacher wanted on the paper and knew how to do the work so it would be acceptable when I just looked at her with hte look of this is my class, my student and she needed to leave.  With a quick excuse on why she was leaving she flew toward another area of the room and left us alone.  The young student giggled and smiled and handed her paper back towards me so I could finish erasing the incorrect answers and we could spend the last moments finding the correct answers in the book.  When the class was finished she only had one question to finish and knew the material for the next class.  I had diffussed the situation without interupting the entire classroom, without embarrassing the older girl and without uupsetting the younger girl.  I feel I did the right thing by just using a look and then continuing on with the work.  Later that night at a school function the younger girl say me in the hallway at a distance and a large smile spead on her face.  while holding her mother's hand she ran towards me and gave me a big hug and a thank you for helping her.  This girl is on her way to entering a regular classroom and with only three years of hearing and speaking, she has more devotion and determination than the "regular" students do and I feel that in some small way I played a little part in helping her assimilate towards a life in the real world and our society.  For this I feel some pride for being a teacher.