Joe Mantis,
what are the applications to 3rd and 4th exercises?
There's an article in the E-zine that talks specifically about 3rd exercise (dropping horse) and some of its applications, check that out.
4th exercise (pow choy) is a drill, at least one type; you're blocking a kick, controlling the leg (as you roll out of the block) and striking pow choy.
As far as drilling technique and practicing on another person, we do that in class. I don't know what drills would work for you, but read the e-zine article and try creating your own drill based on the applications described.
Sam
There is a great streak of violence in every human being. If it is not channeled and understood, it will break out in war or in madness. ~Sam Peckinpah