When the Everfree Forest began crumbling into the Gastly Gorge after an explosion caused a massive rush of water inland, the main 6 and the Princesses are distracted by Los Pegasus falling to disaster, and Ponyville is left defenseless as the tectonic shifting and rising waters begin swallowing the town.
With the magic of Everfree causing pockets of Magical interference and a malfunctioning cloud factoring bringing massive storms with it, not only can no one teleport in or out, but not even the strongest pegasus can fight the winds, with a handful of stragglers left in precarious situations, they must try to free themselves and escape the town before the upcoming storm pull them to a early grave.