What do you think would have happened... *SPOILER*
******SPOILERS******
.....at the end of the film if she hadn't gotten free and killed Nathan? Aside from the fact that I utterly hate what happens AFTER the climatic hotel room scene, I find myself really curious at what Nathan was intending to do once he'd killed Tom, her father.
Specifically, I'm wondering if he would have just let Fiona go, without harming her**. I wonder about this because throughout the entire film he shows no signs that he intends to make her one of victims; his intent is obviously for her to learn the truth. He also takes care not to physically harm her when he finally captures her. Most interesting to me though is that the murder of Tom is a complete break from his murder pattern. Neither Fiona or her father are offered a choice; Nathan just straight up beats Tom near to death then finishes him off. Also, since her mother choose Fiona's life over her own, it seems to me that Nathan couldn't kill Fiona because that would be violating the mother's choice and invalidating his whole system. It defintely doesn't seem like he'd kill Fiona to protect his identity; he deliberately gave her all the clues to discover who he was and knew she'd tell her father and the police.
So what do you think? Would he have killed her, or let her go? Do you think he was hoping she would kill him and put him out of his misery? Any other theories?
**physically, I mean. Obviously he's greatly harmed her psychologically by this point