I was doing this daily(Seared Scourge - Quest - World of Warcraft) in Grizzly hills and some idiot decided to run and gather quite a few of the trolls up and try to kill them. I thought what happens if I throw the fire on top of the player. So I did and got pretty much all the kills I needed in one bomb.
Short explanation: have someone in our party mount up and grab a whole bunch of mobs then one of the other party members just throw the fire on the tank. maybe not the best exploit but when lvling and u can get it done in 2mins for xp it always helps.
/flame on
Someone please delete if u have time, I moved this to the guide section.