After you kill ZK's golems if you position him on the north west side of the hole in the middle of the map and run around and stand on the ledge of the south east corner of the hole you can range attack him and he will not fight back. Been doing this for a while in inferno and its worked out well for me so i thought i would share.
1. Kill golems
2. get ZK NW side of hole
3. Run to SE side of hole
4. Range kill him
5. ???
6. Profit
Edit: Crap I posted in the wrong section, can a mod please move this thread