Who would attack by swinging their arm out like that? There's no way to do that, unless someone is stupid enough to attack like that with a terrible stance.
Obviously, you think you train. 1st it isn't a technique per say from a swing or punch. Second context to the lesson is everything, third will invite you to a seminar any day.
I don't do judo, or whatever that was, but In Tae Kwon Do, we know not to stand like that, and I used to train, I stopped when I got my black belt, it's been 7 years since then.
I got my first Dan ranks in taijutsu. I trained in Tae Kwon Do as a kid. There is a huge difference between sport and battlefield arts. Locking form will get you killed faster. This is a grab technique and he is just showing mechanics. The art is silat. It's an Indonesian art. Lots of knives to worry about so no forearm blocks.
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