I'll throw my 2cents in here. When we killed DG's week 2 we hit enrage at 1% (20k hp). We also had a slinger and a tank die at around 10%. Now I could be completely wrong here, but I would imagine that if our slinger and tank had lived we never would have seen enrage. Also we had no bloodthirst, NP buff, and a shadow dps
. I'd say that given a near flawless run, beating the enrage was in fact possible.