Rejoined a few times to finally see Urdars in act 4, then I decided to go for it. Skeletons from Pindle, Urdars from River of Flames, then change mercenary's gear to Obedience/Duress and my weapon to Hustle.
At first I tried to use amplify damage, but my mercenary got instantly slapped twice, then I changed to decrepify and it all went a lot smoother.


