There was a martial arts movie I remember seeing as a kid that featured two male fighters; one was a serious fighter and the other was comic relief.
The one specific scene I can remember is the final fight at the end, where the two guys fight another guy in a gym. The 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, though.
I saw this movie in the early 80s, so it wasn't Dragon. It was just two 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.