This glitch requires 2 things :
- a friend who can fear ( warlock , priest , warrior )
- a pvp trinket
When you get to the Warden's Vigile tower in Tol'barad , duel your friend near the wall of the tower and let him do his fear. If done correctly , you should be feared inside the building and by then you'll only need to use your pvp trinket . Inside the building you'll be able to see other people and target them but you cannot attack them. On the other side , people won't be able to see you but they can still target and get there pet after you.
Also , with a multi-passenger mount , you can get more people inside !
Here's a quick video of the glitch in action
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Enjoy !