The Storm King finally did it! He has the power of the princesses and is now going to create the storm to end all storms (and that place with all the cute ponies while he's at it). Then, just before he can deal the finishing blow to one of those unicorn pegasus things, whatever they're called, a bunch of other ponies fly right into him (and then the castle he's in starts collapsing but that's hardly relevent).
"Ooh, that's gonna leave a mark" The Storm King thought to himself as he climbed through some rubble "Hey, where's my sta..."
But before he can finish his sentence, he noticed the Staff of Sacanas sticking out of a window, and those pesky little ponies are about to grab it!
"The staff belongs to me" he said in a very menacing tone as he climbed and crawled closer to the staff while the ponies desperately tried to reach for it. While the one in the front could have easily used her magic or something to telekinetically pull it out, but given the circumstances (and the fact that magic usually requires concentration instead of snapping fingers or waving a magic staff around like a lunatic), that isn't really an option.
"NO! THAT'S MY STAFF!" he said, hoping the cute ponies would hear him and...well...keep away from his staff.
"MINE!"
But before he could grab it, the window broke, sending him into that beautiful storm that he created. So much for making everyone bow to your ba-ba-ba-boom, Stormy! "I think I'm gonna be siiiiiiiiiiiiiiiiiiiiick!" he thought to himself, trying to keep his lunch down before and after the storm had settled. But he eventually gave up and an unfortunate underling of his wound up with his lunch instead, all over his fur. The underling looked up at his master, who was already in a bad mood, prompting him to angrily yell (outside of earshot of the ponies in case you're wondering) "WHAT ARE YOU LOOKING AT?!".
After he had done more frustrating climbing, he looked at the ponies and decided he was EXTREMELY over with the cute pony thing! As he grabbed an Obsidian Orb from....you don't want to know that part, he slowly and sinisterly aimed the Orb at those meddling ponies, desperately trying not to give an evil cackle while he was at it, but when he threw it, that unicorn with the broken horn got in the way (much to his dismay).
As he slowly turned into stone, he can only get out the first part of this sentence before being petrified by his predicament:
"OH, YOU..."
SMASH!