observing teachers #2

today i was in my ceramics class observing my ceramics teacher trying to do a demo on grouting your tiles to a plywood board. throughout the demo she was stumbling, had no idea what she was doing, had a student do the demo by reading the directions of how to mix the grout, her own phone kept ringing throughout the demo, and had other students teach how to create a proper grouting board. what bothers me is that at new paltz in the art ed program, we are being trained on how to give a proper demo, and how to teacher a proper lesson professionally. what i don't understand is why is someone who is supposed to be a professional teacher heavily relying on other students to teacher her own class? as a future fellow art teacher this example of a teacher has taught me by far on what NOT to do as a teacher, and what i could do that could definitely make part of her idea of a lesson better.