It does point out how one needs to be totally aware of how a situation is developing. To take action only after someone has retrieved a weapon and is in the process of drawing/displaying it is a little late for you to START implementing your defense plan.
Might have been a better plan to just find something else to do for a few minutes while the party blew off steam and left.
I had a situation that involved an unleashed dog jumping on my leashed dog in a public park. When the other party was told it would be advisable to have his dog on a leash he came uncorked. Profanity and physical gestures. My wife and I stood there and let him blow off steam and eventually he left with his dog. If, after all his swearing and gesturing, he presented a weapon I would have shot. By merely observing his actions and not partaking in the "name calling/shouting match" I was able to be aware of his "state" and be prepared to act if necessary. He scared the "stuff" out of my wife but apparently he wasn't prepared to take his "big mouth" to a gunfight.