That's intriguing...
we were many different schools of bat-jam-dao use? Perhaps the longer variants demanded a shortsword-like approach where-as the smaller ones demanded a double big-knife approach. I have been watching baat jam dao forms on YouTube, and I think the Wing Chun and Hung Gar blades must have been short to allow for spinning the blades for momentum within very close-quarters. And yet, there's examples of blades longer than that, but equally effective looking...
