Charles Hill wrote:
I have never seen a class where the teacher gets up and says, "Everybody, do shihonage," without demonstrating.
It is fairly common in our dojo for a sensi or sempei to ask a couple to several competent students to spend time working on a particular technique and not feel the need to demonstrate it unless specifically asked to do so. In my mind, this helps to impart to the student that they are beginning to grasp the basic concepts of a technique and are able to work "without a net" unless they feel they need one. It may also serve to help a student who resents help to see the need for seeking it.