Pretty minimal. The guys holding swords are not allowed to do anything they aren't told to. You make it more/less complex by narrowing what the puppet masters get to say. So for instance, this is a basic level one game. They are saying weaken. Level 2, they might have to say durchwechseln/zucken/hanging parry Level 3 might be they have to say which foot moves how. But as long as you know what technique beats what other technique and when it must be executed in order to do that, it's not hard to find the rhythm
I might also suggest that if you don't have a named technique that you know is the correct response to every other named technique in play, then it might be hard to make the game work. It only works if all four people know what all the techniques are, when you use which, against what other techniques you use which, and who's offense and defense turn it is. You will notice in the video, both players don't take the offense at the same time. That's because everybody knows who's turn it is at all times.
