Sword Blocking with your fist?

[Corgis]

I've seen a few youtubers do this, they just block but... with their fist? I've tried to do it and read a thread about it, but it didn't really help. If anyone has any idea on how to do this it would be much appreciated. I know it has no use because nobody other than you can see it but I'd still like to know how to do it.

ok thanks for reading and stuff byeeee

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