Apparently, the citizens of Ponyville can't appreciate a good Nightmare Night celebration.
You're here to change that, or die trying!
Probably the latter.

(2nd person story)

You're sat at home in a violent thunderstorm one night when you notice Scootaloo in your garden. Why is she there? ...Doesn't she have a home to go to? And will she find a new home under your care?