It helps knowing how to use one for sure, both on confidence and in the event that you would need the skills, like fending off a needle.
Intelligence, as in information about your adversary and his methods, are always good to boost confidence and device defense/attack plans.
What are the chances of being infected with HIV anyway? Was it a syringe with blood in it, or just a sharp object? The
difference matters.
IMO
Husar did the right thing. Playing poker with your health is not worth it. People with skills could call your bluff.
If on the other hand
Husar was trained in Haganah or Krav Maga or spent time in the military, he could have just-fully threatened the guy.
Screaming your lungs out just tells the criminal that you can't back up your bluff. These perpetrators would be more afraid of quiet but direct orders.
As I was told by the riff-raff I met in Scotland, "We are more afraid of the quiet ones".
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