So I just watched this recently, and I'm a little confused.
The film is titled the "HP and the Half Blood Prince" which suggests whoever it is (HBP), plays a significant role in the film. So we find out that Snape is the HBP at the end. But what does it mean? Is it just some meaningless alias that he used back then?
If it is, I find the title of the film a bit inappropriate. But then I guess they didn't really have a main story line did they? Just kinda went along and... well Dumbledore died, I guess that was the highlight.
Now I never read the books, but maybe in the books Snape/HBP had a more signficant role other than being revealed to be on the dark side at the start and then having another part at the very end.
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Ok another question - why did Snape agree to the Unbreakable Vow at the start? Seems like a pretty stupid thing to do. He doesn't have to prove anything to Helena Carter. I mean if it was Voldemort himself requesting that Snape prove his loyalty, I would see why he would do it, but otherwise, why put yourself at risk?
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i have a really short answer...
if you want your questions fully answered, you're going to need to pick up the books. and not just the sixth - but all of them. they'll probably to some explanation in the final film, but don't bet on learning the answers to all the questions you pose.
so no, i'm not going to make it easy and spoil it for you. because i wouldn't be able to bring off all the answers with as much creativity and elegance as JK did.
It does not do to dwell on dreams and forget to live.