Yesterday I was killing pesky alliance in booty bay and found out if you go on top of the booty bay entrance with your friend you can duel eachother up there. The rogue jumps down kill the allys and maybe a few gaurds and then shadowsteps back up to you. No gaurd aggro! You can also do this in Darkshire on the air pumps. Basically duel . Kill. Aggro. Shadowstep. Win