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I saw a demonstration on this last year. Although the focus was on Bartitsu in general, watching the instructor wield a cane, and then letting us take turns practicing with canes, was crazy. Who would have thought a whole fighting technique would pop up and be so efficient. He did say the Parasol and Umbrella fighting tended to focus more on jabbing your attacker instead of hitting them because they are too light to do much when just smacked against someone.
Indeed! That is so exciting! I wish I could have been there!