Hello I am the admin who handled the PK Ticket, you were PKd due to initiating a fight with the police, in this fight you had killed a cop (the probie), after killing that officer another officer behind you killed you.
While yes it is true the cop shot your friend, the cop did not shoot you so to say it was "self-defense" in my eyes is unjustified. You were not defending yourself you were defending your friend, a friend who committed an illegal action. The cop did not attack you until you had initiated the gun fight with him. If the cop had directly attacked you first this would be a different story, but that is not what happened here.
heres the PK clip for context: https://streamable.com/7murnb
I specifically asked if you understand what was happening, you didnt reply with any sort of question, all you said after that was towards the cop and you said "what can i do to not get pkd" to that said he said "100k" likely in a joking manner, eitherway that would never be accepted and youd get pkd regardless.