His sister, his inspiring, remarkable, capable, hard-working, rousing sister, decisively not having had her fill with her impressive reputation, apparently took the liberty to go above and beyond. Bad enough that she had made an absurd number of friends not even a single day after emigrating to Ponyville, but as it turns out, she and her new ragtag gang felt the need to thwart a villain with unfathomable ease as a team bonding exercise. Saving Equestria so that everypony could live happily ever after, so said the scroll.