He wouldn't need to "know" how to use it, Just get you with it and your in trouble.
During my "incident" 2 others grabbed the guys arms, He stabbed one in the groin, The other in the face.
No "know how", Just rage and tools.
Not that I can tell you how to handle such a situation, But if the man or child is going to use the knife on you then there is little reason to expect him to show it to you so you can gauge his skill level. More likely poke ya in the gut.
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