I'm sure there's a perfectly reasonable explanation for it -- maybe they were seeing the future in the Force, and were racing to "out-see" the other person, or that were trapped in some sort of loop of feints and counter-feints. But if you compare that to the final duel of Episode 1 (which, I would argue, is the best-choreographed duel of the entire saga), it just looks silly. In that fight, every blow was an attempt to cut the other person.
It may just be that what they were trying to convey did not translate to the screen (for me, at least). I can sort of get my head around "I went to make a move, but he moved to block it, so I adjusted to another move, and he adjusted to my adjustment..." ad nauseum, but it doesn't map to my knowledge of how swordfights work. Or, more to the point, processing and anticipating at that level doesn't jibe with every other swordfight in the saga.
Or maybe it's just me.