Got about half way through after the room with the heavy bolter where there's some snipers or something scattered about. I died once in that room and when I reloaded, I went back into the previous room. It wouldn't let me back through door so I thought I'd reload to see if that fixed it, but that made it worse. Now, the character simply falls to his death, the mission reloads and he falls again etc.

Not sure if my save is boned and I have to start over or what, so looking for ideas please