I “open carried” for decades with my duty sidearm, half of my time was in a uniform and half without. If I had a dollar for every eye that went from my face then down to my gun/holster during my workday, I could have retired many years ago.
It was beaten into your head in the academy to always be aware of your sidearm. You learn to hold that elbow down over the grip, or sometimes even put a hand on your gun when in tight, like the high school story related earlier. In a snatch attempt, even grabbing the bottom of the holster and pulling up hard drives the grip into your side, keeping the gun in place so you can fight with the off hand or grab a back up gun/knife to defend yourself. It’s not fun training for those things, you get bruised and sore as you get yanked around and hit the mats. But it’s better than dead, so we did retention training at least annually.
Awareness is key. Dozens and dozens of times over the years I let gangsters, parolees and other thugs know I was aware of them as their eyes scanned my belt. “Up here, mister” would get them to look me in the eyes and let them know I wasn’t oblivious. Best part is this almost always stopped their gazing at the holster.
I don’t know if it stopped any possible attacks, but my gun never was grabbed for so maybe my attention to them did prevent such stupidity. I’d like to think it did, anyway.
IMHO discrete ccw is the only way to carry for anyone not paid to be in uniform. I get it that some folks like to broadcast the freedom thing, I am a firearms rights supporter, too. But hanging a gun out in a holster is just asking for attention that the open carrier will undoubtedly attract; from good guy and from bad. Myself? I choose to be as plain and faceless as possible so my stuff is concealed.
I spent 9.5 years on our SRT unit doing dignitary and witness protection details, we trained constantly on spotting threats by “actions, looks and lumps.” When things were spotted, we acted on addressing them before things went awry. I don’t claim to be a wiz at it, but as an individual and in a team we got pretty darn good at keeping people away from harm. Even in a crowd, by watching for out of place things, expressions and body language one can see who commands attention; and then one learns to spot threats like guns, knives, etc.
Crooks, like the one in the OP who snatched the gun do it, too. He saw an unaware guy who was armed, found an easy opening to attack and disarm him, then took off. I still don’t know if his gun was open carried or was a ccw that got exposed somehow. Nevertheless, the guy with the gun got complacent or got distracted, he let his guard down, and sadly he paid dearly for it.
Stay safe.