Hi, been teaching many years now and not had this issue before but now had it twice in last six months. Support assistant pounding around the classroom, reprimanding bad behaviour very loudly without seeking support from classroom teacher first which then puts the other students off and ruins the tone of the lesson, giving permission for a student to leave without deeming it appropriate to ask/inform class teacher and the final really huge issue - asking for everyone's attention in the class and then teaching a small topic!!!! This has ALL happend in ONE lesson. It serves to undermine the teacher and confuse the life out of the students. Support assistants are there to support; this is totally unacceptable and they need some serious cpd or refresher on their understanding of their role!!!! Please let me know if you have experienced anything similar; how you dealt with it and how this can be stopped from happening as it VERY uncomfortable and unsettling.