The OP isn't a riot officer either.So your thought is just as good as any's
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https://www.youtube.com/watch?v=wgX3H1whsRE
I'd be worried if my neighbour is wanting to buy riot shields after looking up methods of kicking in my door
A riot shield would be nice to have against this guy https://www.youtube.com/watch?v=v-UBe22y1dE
A buckler style disc seems terrible to me, but maybe I just don't know the necessary techniques.....