After discussing this appeal with Jokerman I will be denying it.
I was provided with video evidence of you damaging Jokerman repeatedly (around 3/4 times) with your stun stick. Of which, Joker eventually retaliated by killing you. I revived you afterwards which allowed you to kill Joker. After he was revived you killed him again, of which he had not done anything to warrant being killed.
The first kill is legitimate since you were defibbed however you should not have killed Joker again after he was defibbed - in my opinion this is a valid warning so it will not be removed.