I had to call it quits in that particular fight as well. I was so frustrated that I wasn't able to finish the game (nor able to leave Hall of Echoes and finish some other quests) that I ended up uninstalling the game (which I normally don't do with RPGs as I play them at least a second time around). Up to that point I was actually enjoying the game very much.
Mind you - I was playing on "easy" and still wasn't able to beat those final guys.
Cheers,
Rainer
