[QUOTE=MaltonNecromancer;159171]Knowing the end of a story at the start isn't a bad thing. Done well, it can be utterly compelling. It's called "dramatic irony", and is an extremely effective technique to really create tension. Some famous writers have used it. You may have heard of William Shakespeare (though I hate to presume). He uses it in almost all of his stories; look at Romeo and Juliet - we're told right at the start that they kill themselves. The thing is, we're not told why or how. Thus, the more they fall in love, the worse we like it. When Romeo leaves, Juliet says "Oh Lord, I have some ill-divining soul; methinks I see thee now thou art so low as one dead in the bottom of a tomb", and we as an audience know: she right. The next time she sees him, he's going to be dead in a tomb. Thus we feel more sympathetic for her; fate is not necessarily a nice thing, yes? Knowing the future can be a terrible burden, and you can inflict it on an audience wilfully.
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This is the reason when we see Horus, post turn, do noble things, we can't help but ask, "why, man, why"