Easy as a big bone.

67 rogue
find spot on the edge
kill clefthoof
bang drum
either vanish or run away if non-boss mobs pop

If boss mob pops, vanish,
wait 1.5 minutes
argo mob again and gouge/cs/stun for 30 seconds.

He depop/dies off at 2 min and u win.

(actually took 4 tries b4 he popped)