I will tell you all how to bug a mob or boss so that you can attack him but they cant attack you.

You want to know how to do it? Well ok. First I need to tell you that I never tested it on wowscape or other good private servers. I tested it on
wow.rit.lv private server and it worked perfect but the GM's installed a anti cheat or something like that on the server so that I can never bug monsters in instances anymore 8) but I will tell you what you need to do.
1. You need to have
Wow Emu hacker (the version doesn't matter just need it to use fly hack)
2. Get to the BOSS or the mob you want toi bug but keep in mind he cant have many ranged attacks. The best is meelee mobs or bosses.
3. It is great if you do this bug with a hunter because thay can do heavy ranged dmg and do not need many mana for their attacks
4. Get in the instance or elsewhere where you want to bug the boss
5. Use your fly hack.
6. Fly above the boss or monster and hit him with a ranged attack or spell.
7. Dont lose height but fly away from him so that he follows you in the air at the exact height you are.
8. Wait for him to come closer to you and fly down in a 90 degree angle.
9. The boss or mob in many servers cant get down in a 90 degree angle and he is stuck in the air about 20-30 yard away from you and he cant hit you with any meelee attack. But keep in mind his spells because they cant hit you. If you want to avoid the spell you need to bug him far away him from you.
10. If you get enough aggro and have a good threat meter you can do this bug with other players to get the boss down faster. Everything will be just fine if you hold aggro and others can help you to kill the boss. But be careful because that any other player dont get aggro on the boss or he will come down and kill you all
P.S. I tested it on Temporus and Aeonus (both heroic) and killed them quickly. But Aeonus is a bit harder because he uses mass spells like sand breath that means the mob need to be more far away from you in the air. When you kill him just fly up to him and get the loot. I hope you all will have a lot of fun with this bug. ^^