Well, duels also famously occurred with pistols. But I am using the phrase loosely to include open hand duel type fights, as were occurring, it seems, in the context of where BJJ was created - see this vid at 0:42, for example:
Ok never heard of that before, I still don't quite get where your going with this as it all seems to be based around sports or such like. That guy just looks like he has mixed in something else which if it works for him then cool
It's still part of Brazilian culture now, it seems - capoeira of course, and like the "funk dance battles", fought in NY city in the 60s as precursor to breakdancing.