For anyone confused, the video basically goes through the story of the first movie and just before the end of the final fight, it cuts to the story of the second movie. At the conclusion of the second, it cuts back to the battle from the first and ends there (think of the second movie kinda pausing the battle of the first). I wanted this video to kinda show the story of Hiccup and how he met Toothless, and in order to fit the music the way I wanted it to, this was the best way to do it. So if it seems random that the first movie is there at the end, that's why.