We had a class that focused on the use of the jo. Shihan focused on things that showed how parts of the katas are used in jo waza. The thing I noticed was the way everyone slowed down, was careful with their uke and nage, and practiced the techniques being taught with a heightened awareness. It's one thing to flub a technique that involves a strike with an open hand. It's very different to hit someone with a five foot oak staff.