@rukelnikovftw: They showed it after Kefka had taken the Triads power, and it was already stated by Strago that the Earth should react that way if the Triad's power was set in disarray.
The thing Kefka has going against him is that he's not a fighter. He has a lot of raw power, but he doesn't have any finesse. And this is supported throughout the series. Kefka is smart, and powerful, but not trained. It's why he is defeated by a group of people nowhere near his power level.
Thanks for reading,