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There was a hacker, Matrimony, who was a cub and could do things in creative. I have tried to get the Screenshot on here, but it will not let me. He is on survival.
proper steps of reporting issues: 1) Ask for help from staff on the server. 2) Create a modreq at the location of the incident. 3) ask for staff from other servers, if nothing else they can observe and report to staff who can do something.
4) MineCats has a discord guild. http://discord.me/minecats - once in the channel, tag @staff with a request for help Failing ALL of that, then create an "other problems" ticket WITH IMAGES: http://minecats.com/support-request Forums are NOT the place to report issues like these.