What happened is that Jack bushross was trying to help the new player from being arrested and after that failed he shot you for arresting the new player (an endangered species on the server(must protect at all costs)), you can argue if the kill was allowed or not but in the end you are not to decide that fact, the admins decide that. Jamie has had a squeaky clean rap sheet for multiple years and therefore I believe he would not waste that beautiful rap sheet on a simple rdm warning.
Regarding the verbal warning part, from the info I received from multiple reliable sources you were verbally warned numerous times before this, therefor a standard warning being placed was the correct action. arguing this point is useless because the admin's word is final.
Best of luck