'Presence' used to be taught to teachers. I have seen a rowdy class immediately silent when a tiny ancient nun came to the door and said quietly, 'Quiet, please'. She had 'presence' which she consciously exerted. She could use it on a whole yard of playing children. It is a conscious thing I have seen it used by many old teachers, and have learnt to use it myself. Shouting only teaches children to shout - and they shout louder.