There was a Karate movie I remember seeing as a kid where it was 2 guys, 1 a serious fighter the other was comic relief fighter and extremely funny (may not translate well with age I suppose). Anyhow, the only way I can remember this is the final fight at the end where the 2 guys fight another guy in a gym. They guy they fight uses weights to fight them, but of course he loses. I thought it was a Bruce Lee movie, but it doesn't really seem Bruce Lee did that many fighting movies, I could be wrong.
Sorry, I saw this movie in the early 80's, so it wasn't Dragon. It was just 2 guys versus the one guy at the end... I was in Atlanta at the time and I think it was on Kung Fu Theater or was it Kung Fu Gold? Channel 46 or 69... =-)