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I'm surprised it's on Youtube, but I also can't watch it in my country, it says I have to verify my age. But I have seen it before.
It's another example of how ineffective body armour seems to be. I don't think I have ever seen it work and I think it's probably because it really does not cover much.
So in this case the Wagner guy is trying to sneak around the side of the position so he gets shot in the side where there is no plate.