Fat redneck in the blue shirt that pulled the knife and screamed, "I'll cut your F'ing throat" while advancing on the biker crowd should count his lucky stars one of those young guys wasn't packing a CCW and didn't poke several 9mm holes through that blue tee shirt. Same might be said for the shotgun guy when he exits the truck with his gauge. It looked like a fist fight until the hardware gets displayed. There's so much stupid on both sides it's hard to sort out who is actually the most right and wrong.
He may be lucky he didn't get shot, but those college boys are lucky they didn't shoot.
You cannot claim justifiable deadly force if you are part of the agreesion before it went deadly.
These boys were the "agreesors" , when things got ugly and weapons and death threats emerged, the use of deadly force would not have justified, they would have been arested and convicted.
You cannot pick a fight, then claim self defense.