Or instead of stooping to their level of dickery, just say in the first instance what happened rather than "taking matters into your own hands."
I'm not an admin on the server, but I will stick up for them no matter what **** anyone throws at them; they've put a lot of time and effort into getting the server running smoothly with some excellent scripts on there, and all they get is ****.
They like to play and enjoy the game too.
If something happens, report it. If need be, hop on Marker's Teamspeak - the details of which you should easily be able to find, or if not, just ask on the server. By teamkilling the prat you are yourself breaking the rules, so why shouldn't you then receive a punishment?
Being completely serious here, simply because people are part of the "OCUK Community" it seems to make them think they are high and mighty and immune to repercussions; newsflash, that ain't how it works.
I'm sure Marker & Co will gladly unban you from the server, if you provide your name at the time, but just bear in mind that everything that goes on on the server is done through word of mouth and quick glances through logs - people make the wrong decisions sometimes, they're human, it happens, get over it and move on - there is absolutely no reason to throw a tantrum over it.