This only works for hunters,
but if you train a pet, for instance in the barrens, outside crossroads there are lions. For arguments sake lets just call them "lion".
So you tame it, and name it to "Lion".
Stick your character somewhere out of sight, enable pvp, then use eyes of the beast.
Run around with the pet until you find a horde, sit in the road with it or something, so when a horde comes past he/she might think that its bugged, as soon as the horde attacks, put on aspect of the cheeta and go kill him.
easy eh?