I tried to quest in Hellfire. Yep. I watched a 90 orc warrior smash a mage in front of my face. Then as I waited to die, he waved. A 90 mage and ele shaman fell from the sky and blasted me into the canyon. I disengaged to survive the landing, only to be smoked by a 90 rogue. Good times.
On the plus side when they are my level, or even a little higher, I always kill them.