well this is working as intended i am sure but it is some what of an exploit.
Well in Howling Fjord North east Area there is a cave that you must have a Worg Disguiseto enter or you get attacked. Well If you have ranged attacks you can sit near the entrance and if you hit some one who is in a costume it will break the Worg Disguiseand he will be attacked by all the surrounding Worgs.
Worg Disguise - Item - World of Warcraft
http://i176.photobucket.com/albums/w197/impulse71/blahsht-1.jpg
by impulse71