Great video. I see no ashtrays on the bar. I assume they were vaping.
While I can't be sure of how I would react in this particular case, the gunman was of no particular threat to the guy just sitting at the bar. He was far more forceful with the guy on the floor next to him. Now, I've had a gun pointed at my head at least twice. (I only remember two instances. Would I forget having a gun pointed at me?) According to one guy (who became my friend, drug dealer after the incident) claimed I laughed at him. I'm sure it was a nervous, "how do I deflate the air in this situation?" kind of thing, but I acted calm. Inside I was a bit of a wreck. But I didn't believe he was actually going to shoot me. The second time was a bit less intense with a guy threatening everyone, but didn't seem to have much conviction. I more or less did what this guy did, and just tried to keep things calm.
The reason I say I'm not sure what I'd do in this situation is, I can't hear the guy's voice or know exactly what was going on. I suspect I might just sit on the floor to avoid the personal attention. But sitting at the bar worked for this guy. With all that said, if the guy pointed a gun at me and demanded my wallet, I'd just give it to him. Money isn't that important.