At 4:15 he also demonstrates full grip, then does a few full power murder strokes (mordhau) while holding the sword that way, and shows his uncut hands after.

Of course, we don't have to live quite that dangerously ;-)

If knives were to instantly cut on touch, blindly groping for them in the suds would be way too dangerous. (And I haven't really ever gotten cut that way either, so go figure)

I get it: you like swords. Well I've played with knives. I've grabbed knives and machetes and other sharp-edged tools. I know how to grab a blade and all that good stuff. There's plenty about swords and knives somewhere else on the WWW.

While washing dish utensils through my life I have observed something I thought was truly surprising and unexplained. Can't we focus on that?

Maaaybe I do like swords. And I mean, who wouldn't want to use that particular video as a reference sometime?

To be fair I honestly did think that that was the part that was mystifying you. Sorry about that.

I guess you're focusing more on the neural-network self-learning going on? Or... what's the interesting part to you?