Per the acronym guide CG = ComunityGoal ???
I was a High Resource area of a ring. Players (human) with bounties (wanted) show up (not sure why? to rob the miners? PvE against the Local Authorities?)
Th local authoritied (game police) attack those (humans) that are wanted or commit a 'crime'. When they are down to hull damage I fire a shot or two at them. When the police kill them sometimes I get the bountiy.
If you shoot at any human for any reason, you should
expect them to shoot back.
It's also very easy to get wanted, even while doing legit bounty hunting, in RES.
That person might have been a noob, too.
(Sounds like it to me, tbh.)
They might very well be thinking you killed them unjustly, based on what you've shared.
(I would heartily disagree, but I'm mean like that apparently!)
It is wise to treat any hollow icon as hostile until you know different.
Even a friendly greeting might have nefarious intent.
That's a big part of the fun to many people, including many that have no interest in combat.