This one is an example of what happens when you have a force staffed by overweight weak old men. While the victim here kind of secured his own fate when he started laying a real beating on the cop, the cop is the one who instigated the situation.
Outclassed in a hand to hand fight that he started the cop is forced to draw his gun and kill this Firefighter (a true hero) when the man overpowers him and starts pummeling him. If only the firefighter had managed to land a knockout blow on the first strike the tables would have been turned.
Remember when fighting back against tyrannical cops go for the kill / takedown as fast as possible. Don’t give them a second to access their firearm as they will immediately resort to that when they realize they can’t push a person around.