[hue]

I think a lot of this is due to direction of mind and energy. A teacher's vision and mind is directed outwards looking at the pupil and scanning through the various ways to help him and reach him. This takes a lot of mind ,energy and attention and as a consequence mind and energy is taken away from one's self. Playing mode is differemnt from teaching mode and it is not easy to hop from one to the other. To be your best player I think you need to be selfish and protect yourself.