I was struggling with the dispells on the pit lord enslave. I was trying every strategy I read on it: move the Pit Lord away, stand behind portal, etc, etc. Eventually, I said screw it and that I wasn't going to run from the dispell. What I would do then is have the Pit Lord charge the first fel hunter that spawned, breathe on it, conflag it dead (sometimes would have to follow with a SB to actually kill it). Then as the next two came out, I would havoc one, shadowfury, chaos bolt and then Fire and Brimstone conflag them dead.