The Astronomy Tower AU||If/Then [WNWT Round 1]

Please watch in HD

This is my entry for the first round of the second season of WNWT. For this round, we we're tasked to change a character's decision, and show how it would affect the rest of the story.
This was actually the first idea that came to mind, and I knew even before starting on it, that I'd regret picking it. I've put together the opening dialogue last weekend, then for the rest of the week, I've tried to come up with the rest of the story. I ended up with 4 different endings, picked one, and finally started on sat., but came Sunday, and I had to really rush, so I used another ending. This is definitely not my best work, the story has a lot of flaws and editing's really simple..but I hope it at least gets me through the next round :)

What I changed:
What if Draco killed Dumbledore, even before Snape got there.
Draco got a huge confidence and ego boost, but at the same time a huge amount of guilt and fear.
Draco sold out Harry in the Malfoy Manor. He knew how Harry liked Dumbledore, and he knoew how much he must hate him for that. So it would've been better for Harry to die there.
Voldemort tries to kill Draco, in order to be the true master of the elder wand. Snape tries to shield him, but they both die.
In the forbidden forest, Narcissa, having learned that Draco was dead, tells the truth that Harry is alive. Harry and Voldemort duel for the last time. Voldemort's killing curse rebounded on him, as the elder wand's true master is Harry. Voldemort died, and Bella in rage hits Harry with the killing curse.
Nagini survives..which means, Voldemort will rise again!(evil laugh)
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Fandoms used: Harry Potter POT, HBP, DH 1&2, Rise of the Planet of the Apes
Song used: (Corruption, Duduction, You will count our dead, Black Blade) by Two Steps From Hell
Somewhere I Belong(Instrumental) by Linkin Park
Colouring Credits to: marixluvsdamonx3
   / marixluvsdamonx3