Ponies In Reverse

Watch Tower ascended into Equestria from Tartarus and cast the following spell:

“By the power of darkness, Equestria I curse, by stopping time and making it reverse!”

Unaffected by his own spell, Watch Tower stood back and waited for the gates of Tartarus to re-open (more accurately, un-close), keeping a close eye on his boss, Horseback Archer.

Then, all throughout Equestria, alicorns, unicorns, pegasi, and Earth ponies alike screamed in fear as the sky turned pitch black, signaling the reversal of time throughout the land.