We’re not quite sure what happened prior to this shooting, but the two people of focus seem to have possibly had some interaction outside. In any event, things escalate quickly.
There was a little talk back and forth, but nothing that would prompt someone to begin fearing for their life. Poking the bear, however, isn’t the way to go about most business. That’s what happened here, and the initial talker ended up pulling out a gun and shooting the other man with very little warning.
As armed citizens, or anyone, there’s a lot to learn here.