A very good question.Something else comes to mind in this discussion. When interpreting kata, do you assume the opponent has a cutting weapon in hand? Even if you don't know for sure, do you assume they do? Does this affect your bunkai? In bunkai dealing with an initial attack, should the bunkai be interpreted and worked out according to the assumption that the other person has a cutting weapon in hand? I could definitely be wrong, but one of the reasons I don't believe karate was meant for back and forth fighting is precisely this point. I don't particularly think karate as a system assumes the other person is empty handed
I don't know.
I don't (assume it) for a simple reason: if there were a reliable way to survive a knife/dagger attack, we would know (for any longer blade, the only thing you do is run faster than the other guy if he's even minimally competent).. and we don't. Evidence (well, a recent Jesse Enkamp video with a knife defense expert, but Jesse usually doesn't publicize bs and the guy made sense) tells us that the great majority of survivors of knife attacks aren't trained in any particular way. We don't know about the people who do not survive, but in that case training wouldnt matter anyways.
Since knife attacks havent changed particularly in the last hundreds of years (if anything, nowadays there's less people competent with a knife), I doubt karate would have been developed for that. Also, if you add that metal was non existent in Okinawa, so all blades had to be imported, it feels to me unlikely that a specific anti-blade unharmed skill would develop. We also have kobudo, which had the sai whose job is exactly to counter blades (basically, trap the arms before they can be unsheathed) so the specific mechanism of karate seem to be limited to unarmed combat at close distance.
However, it's fair to say I've read that you can use similar movements with say a bo (staff) with minimal adjustment, and some of the kata movements do seem quite natural that way. On the other hand, there's specific weapon katas, and the ones we got were kinda advertised consistently as not so.
So I think classic karate kata were illustrations of principles and drills for unarmed combat which had been previously practiced with the teacher, while kobudo katas are for weapons. But different evidence should surface, obviously I would change my mind.
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