Raiding zone? There is no such thing... unless he steps inside the building you are raiding or if he interacts with the raid you can't kill him, so the rdm warn was justified.
As for the mute, he told you to stop causing drama where it is not needed, you may have interpreted it as him trying to silence you from speaking your side. But infact as he later said I believe, take it to the forums.. but as you continued the mute was again, justified.
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