I dont think its a bug. The games suppose to be hard. Its not like those sissy RPGs that hold you hand like oblivion. I'd say it was pretty hard to kill raze on normal. I was a level 26 mage. All I did was disable the heal tanks, beat on him with my weapons, rather rinse repeat. He was rather easy that way. Just ignore the extras and beat him down.
This game hard? Heaven forbid you ever try Risen or one of the earlier Gothics. This one is a walk in the park. Not to take anything away from it, I find that a nice change of pace. But if you carefully build up your character as much as possible, you can breeze through most fights. That said, it
is a bug that some bosses can one-shot you before you even have time to chug a potion. Raze is notorious for it. I do recall there being something said about a patch fixing this, but if you don't want to wait, exit, do a few other things, and come back. He handed me my behind 5 times in a row, so I went out and did a few other quests, when I came back the only issue was his annoying heals. So exit and try again, or exit, get a few levels, and try again. It's possible too, if you drink a full resist potion before triggering his speech that you may do better.
I might add, that for those who find tough boss fights tedious, it is entirely possible to go into options, set the game to easy, fight them, then go back and put your settings to wherever they were before. The difficulty settings were specifically designed for this because the developers knew not every likes tough boss fights. For some it's more getting there than the actual fight.
