I did a playthrough of DKS on normal and I'm now doing a second playthrough on hard and I've run into a huge problem with the Raze fight. I'm level 32 and pretty well-equipped but the problem is that I pull the two levers, go after Raze, as soon as his health gets down by half he instantly teleports into one the two health chambers and regenerates. It doesn't seem to matter how fast I knock his hit points down and I found that he was doing this even though the health chamber was turned off. In one try I beat him to the health chamber and turned it off but he then immediately just teleported into it and regenerated anyways.

I tried everything I could think of but it doesn't matter. No matter how fast I run around pulling levers and then attacking him he just automatically teleports into a health chamber as soon as his hit points get down by about half. When you combine that with the fact that he's doing 400-500 damage per hit with his magic blast and huge numbers of level 26 minions pouring in the whole thing is impossible. Time and time again I knocked down his hit points and was close to beating him only to have him instantly teleport from the middle of the room into a health chamber.

I don't remember this fight being anything close to this level of difficulty at normal. Could this be a bug ? Am I doing something wrong ? Any tips would be appreciated. Thanks in advance.