Great Animation
The drawing was good, the music fit well, and the story was very original.
I watched the version with Numb, as well. Yes, the timing fit a lot better, but the song you used here has a much greater emotional impact, which outweighs the timing issue. Sure, it would have been better to have both ways, but this is enough.
In response to Olimar011:
Yes, stabbing Sonic with a knife is a horrible way to end the life of the great Blue Blur, but, tell me, how else do you think Tails could have beaten him? From what I understood, Sonic was exactly the same, just evil. Tails had no chance. At least the Concealed Knife was a realistic way of finishing it, without having the time to come up with a cure and being outmatched in every way.
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Anyway, like I said, this was a great animation. I hope to see a lot more of the same.