After a magic mishap Fluttershy was turn into a dragon. Not use to the new look her friends attack her thinking she a dragon here to attack Ponyville. Once thing calm down Twilight explain what happen and promises to turn shy back to the way she was.
I am a big Spike fan, so most of my fanfics will have Spike and/or CMC as the main hero's. If you have come here for some logic than this is the wrong place...maybe