Very easy! Went back to town to res merc once although I didnt need to. When fighting melee I was inside his lightning thingy and he focused mainly on my shadow
Great drop
All in all act 4 was a lot easier than I expected (given the prohibitive rules and my low damage). On to act 5! Should get tough from ancients!!
Quote (Mr Textbook)
Act 5
In Act 5 Nightmare, you may not do any re-runs intentionally.
The item that Anya gives you, you must use until you have defeated Hell Andariel. Please screenshot the item.
From the time Baal starts summoning until the time he enters his portal, you may not go back to town for any reason. You may not drop potions in prepration for this either.
If Baal drops:
A set item: You may re-run Baal up to 5 additional times.
A unique weapon: You may re-run Baal up to additional 3 times.
A unique helm: You may re-run Baal up to 7 additional times.
A unique Ring/Ammy: You may re-run Baal as many times as you wish.
More than 2 rares: You may not re-run NM Baal ever again. This trumps all previous drop rules.
More than 2 magic items: You must use those magic items until you defeat Hell Andariel. It will replace an Anya item if applicable.