Now I am just posting what just worked for me. Perhaps and likely there are better ways. I am just a Nub.
Anyway I did it in a three player game, the demon hunter dies fast, the barb stayed alive quite awhile and helped a lot.
After that I did meteor as I run, bit never stop running or he 1 hit kills you perhaps.. I play a wiz btw.
It seemed to me that if you stand still he one hit kills you with tele, bit if you keep moving, zero chance of that.
I use meteor while running in normal form and archon with tele all I can.
Tele away shoot, run, rinse repeat. Eventually there are no more shadows just you and him, just make sure you never stand still, cause he might one shot you.
Anyway I did that in a three player game and my equipment sux and so do I.