Jason,
This is also a good example of the benefits that ample preparation can provide. It's also important to be sensitive to the pulse of the class, their degree of participation and apparent understanding. Too many times the instructor just barrels along assuming students are following each teaching point. Frequent checking for understanding better assures the class is "getting it", and if not, that's a cue to the instructor to back up and review before moving on.
Barry Westling
