Is this legal in California?

Police: Gang Member Killed By Man He Was Trying To Rob - News Story - KNBC | Los Angeles Self-defense against armed robbery in LA? Who would have thought?

They got the victim/aggressor (I would say goblin) wording correct. What they don't say is if the intended victim faces charges.

Police said [the dead guy] stopped the car and, with the other gang member, apparently tried to rob a man walking down the street.The intended robbery victim pulled out a gun, and as the two struggled for the weapon, shot [the aggressor] in the chest, police said.

I know concealed carry is legal in CA, just not usual.

The dead guy - identified as a gang member - was pronounced dead at a local hospital.