It's been awhile but I'm prone to (calmly) daring people to follow through on those sorts of threats.
I've always been pretty game and don't really have much of a sense of humour when it comes to people threatening me with violence or trying to assault me.
I find a lot of people who wish to be physically menacing back off when you insist that they s**t or get off the pot, because the point of their behaviour wasn't to get into a fight, it was a bluff. I've also found that shutting down someone else's attacks is often even more effective than just beating their ass, possibly because it makes the other party question their ability to control the situation well before you've played your full hand and escalated to a full-on fight.
I use sticky hands a lot when seeking to shut down someone's attempt at striking me.
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"Many of us like to ask ourselves, What would I do if I was alive during slavery? Or the Jim Crow South? Or apartheid? What would I do if my country was committing genocide?' The answer is, you're doing it. Right now." —Former U.S. Airman (Air Force) Aaron Bushnell