I beat the game last night for the first time... twice. In the final confrontation, be sure you have a good amount of life left before your enemy dies. On my first win, I killed him when I had about 20% life left (I could have easily healed myself, but I wanted an epic battle feel). During the following cutscene, I saw my character badly hurt (you know how they clunch their stomach). Well as soon as the cutscene ended, it goes back to the regular game for a split second before going to the next cutscene... and for some reason my character DIED during that split second! I wasn't poisoned either. What a great ending, huh? I had to reload and do the fight over again. But fun nonetheless.
If you respond, try not to include spoilers please!
Edit: Added a smilely to make my mood clearer for Big Brother. Thx