We lost an EF basically because of this guy. if you plan on living through these fights, take him out first. Additionally, your entire allience should focus on one mob, and have a set plan on which ones to kill in order.
We did the Elshimo Lowlands EF, and the beast man banner by the waterfall (not the one by norg). He popped out allong with a hobgoblin Redmage, Hobgoblin Beastmaster, and one other one (may have been warrior).