I've covered this already but for you I'll go through it again.I didn't say "all Black guys are criminals" I said they're tendency is to avoid de-escalating situations. In this instance did the victim yell for help? No. Did he call 911? No. Did he attempt to run after shotgun man got out of the truck? No.
If shotgun man shoots him while he tries to flee, that's murder, open and shut case. Instead victim lunges for his gun. Why give shotgun man excuse to shoot you?
Running from an aggressor with a gun only gets you shot in the back. Yes, that would make it clearly murder, but that's not really a benefit to the victim.
If running isn't an option, fighting is. You close space quickly and get inside the arch of the weapon, gun, knife, bat, doesn't matter, its better to be on the safe side even if that puts you in contact with the other person.
Someone points a gun at you and you're wondering what he has in mind, remember you 4 rules. Never point a gun at something you don't intend to shoot.