My friend turned into a GM

My friend's druid was stuck in Stonebrunt, and the zone was down (this was before Return Home). He petitioned and a GM assisted. When he logged back in, his character was a GM, green name and everything. We assumed he had been flagged as a GM to facilitate getting out of the stuck zone. We immediately went sleuthing for GM commands, most of what we found didn't work, but /hideme did. This was "GM invis" where no NPCs could see you, even see SoS (or players with see SoS). We had fun with it, were never able to do anything really exciting with it but eventually someone saw him with /anon off (the green name), he got kicked off and after logging back in the GM flag was gone.