Hello DB! After looking into this and talking to Orang3 i have decided to Accept this appeal. You should not have been warned as Orang3's event rules do not apply to the server's rules therefore it was not Mass RDM. It also was not warnable as it was in the admin arena. I have spoke to Orang3 and i have explained why this is not a warnable offense and he now understands an should not do this again!
Thank you for appeal and have a good day.
I will get a HA to remove it as soon as one is available.