Recently, a fellow black belt and I were in the dojo alone (we're both assistant instructors and we were finishing a photo shoot for the kids) but anyway, we found the shinai (I think that's what they are, they are bamboo swords with a tensor thing) and we started using them against each other. Neither one of us have experience with them but because of doing karate, we had basic reaction skills. We want to do a supplement class for other karate people but the problem is that neither one of us know anything about the shinai or boken. Any advice or is this the dumbest thing you've ever read?