I have to admit, I'm still glowing from killing my first seventy as well. No shame in being impressed with focused fire :-)

I noticed a two hordies moving suspiciously in a quest spot, so I nuked them and went back to grinding. I noticed I was taking more damage than I should have, turned around to see a 70 warlock dotting me up. I turn my guys and start nuking. He lasts through a few bolts, but he went down surprisingly quick after the 50% mark.