Ok, in this question I am obviously asking for SPOILERS, so be warned.
I recently finished playing Venetica, and I really enjoyed the game. However, it seemed to me that I messed up the final confrontation with the heroine's brother Leon in the Doge Palace. Once the fight started, I lost sight of him. When I had finished the guards, he wasn't in the room anymore, neither alive nor as body. Also, he is never mentioned again for the rest of the game.
So my questions are: What exactly happens to Leon at the end of Venetica? Are there even multiple outcomes? What are the player's possibilities to influence Leon's fate?