So basically these guys train in Historical martial arts but they are not very bright and spar with sharp blades without any protective gear. (This is NOT a good way to train and its extremely stupid on many levels. It's also not historically accurate)
https://www.youtube.com/watch?v=Sn372yYgivA
https://www.youtube.com/watch?v=8SlUiB31gBo
https://m.youtube.com/watch?v=y237mTaexrs&bpctr=1631632353
I get the feeling these guys are part of the reason there's warning labels on pretty much everything nowadays.