If some fat redneck comes after me with a shotgun because I am jogging through his neighborhood, I would fight back too? Who said he would have lived if he did NOT fightback? Wouldn't you fight back if someone came after you with a shotgun for no apparent reason?
If two armed guys are coming at me and I am unarmed, no I probably wouldn't try to fight. With the guy in the truck having a pistol pointed at him, fighting the guy on the street is not smart. There is no way to ninja it and win that fight. It would have been better to comply and use verbal judo to come out alive.
Fighting one guy up close who is armed is one thing. Fighting an armed guy with his armed buddy >10 ft away is a losing battle if the guy is an even moderately decent shot.
There is clearly more to the story on both sides and it's likely that both parties are in the wrong.