You can climb up to the rafters on that fight, my latest play was terrible at persausion, so I just climbed up and got sneak shots from the rafters at the guys. You can CC the Hobgoblin leader, Menacing Strike from Lae'zel is great on the leader.
Just be careful on the rafters, because the leader has an AOE knockback that can throw you from the rafters.
Adding to this, if it is the room I am thinking of, when you are up there you will be able to see that the braziers hanging from the ceiling have health bars.
