that's very possible, when I was farming MM elites awhile back, this 39sorc would try to KS, (I was still 36), sadly for him he would fail horribly. he wanted to have the whole place to himself to grind so I kept at it, he wouldn't stop. 5mobs later he decides to leave (comes back again 10mins later to see if I was still there) and he runs away lol
pretty much just knowing how to play your character and using the right skills can outdmg anyone, that or he had some poopty gear. He pretty much never came back afterwards