Want to know how to stop what happened?
Kill that d00d before he even enters that room. One problem with that tho, games now-a-days have mechanical restrictions, that d00ds can take advantage of, and grief you.
Yes, combat restrictions, pvp switches, trammels allow griefers to go almost untouched, and if they are smart enough, go un-banned. From the small things of \"sorry your to low level/wrong class/I dont like you because your hair is gray\" to big things, as in stealing epic items, there is no way to stop this in modern mmorpg\'s.
Player justice does not exist. I would rather kill you NOW than argue with customer support, which, in turn makes the game COST MORE. Look at Dark Age of Camalot and there extensive customer support, and because of newer games taking away there players, they have to RAISE there monthly bills. While other games, with less than a 1/3 of the DAoC playerbase (ie: shadowbane) still exist, and keep going. Why? Players run the game, and the develpoers/support overlook it, and interfear as little as possable. Tho Shadowbanes base code is weak and buggy, its release almost MATCHED WoW\'s 200k in a few days... They sold nearly 150,000 copys when it was released, just like WoW, in the first few days. Doesnt that say ANYTHING at all? People KNEW it was open combat. It was the major bugs and glitches that turned people off.
There are no solid pvp, player justice games in the market. None that require skill, its all \"levels over skills\". A monkey can play a charactor in some of these games.
Hopefully someday, with the open source community, a REAL mmorpg will be created. Full of quests, monsters, fun, conflict, and player justice, and possably be based on players reactions, charactors skills gained thru the reactions, and NO LEVELS. UO in 3d, before trammel, when true roleplayers built real towns (paxlair on ches, for example).