Possible Spoilers
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I had the exakt same experience...
Just walked away and with one char around the map and Jon started chase me..
After a "lap round the couse" my other chars stood waiting to smach his face.
The battle in Hell was harder but after drinking all my "Potions of invul" it was just as easy..
I had aboute 2 potions per person so with a -4 x 2 (or is it 5 each) att every savingthrow they managed to save almost all his Spells.
True Sight dispelled his invisibility and after a Warding Whip and a few Pierce Shield it was piece of cake
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May Helm smile upon thee..