In order to do this you need to be a class with quite a bit of range. First walk around the outside of refuge point till your over the tunnel that leads into the arathi basin instance. Hop down onto the tunnel and move toward the edge (DO NOT GO TO CLOSE TO THE EDGE ON THE LAST STEP TILL FALL THE GUARDS WILL SEE YOU) now just sit there and blast away guards dont atack you as far as i know cuz they didnt atack me(unless you take a step to close to the edge).
I have no clue if i spelled atari right.