Shimmer half-galloped half-glided to the spot where they had fell down into this cave so long ago. She saw the sunlight pouring in from the hole in the ceiling, and the boulder that she had levitated aside, off of Sizzle's wing. She saw old, old bloodstains on the center of the floor. They seemed to be ancient. There were even still a few stains on the bottom of the boulder. She shivered. Shimmer didn't like remembering that awful time when they had fallen. Neither did Sizzle, so much that even if she did walk around freely through the cave, she never wanted to enter this room until they decided it was time to escape. Shimmer didn't complain. In fact, she sort of agreed with her, though she needed to enter this room to get to other important places, like their 'fridge'.
They had a cold cave section that was deeper in the ground than the rest of the cave, and they kept apples that they harvested off the trees that they weren't going to eat immediately in there.
Shimmer walked over to where the sunshine shined through, and looked up. She saw blue sky and a part of a cloud. She took another deep breath - the third she had to breathe in that day - and fluttered her wings as she flew up and used her hooves to climb.
It was taking a while to climb up. She hadn't even gotten to a quarter way up when disaster struck. Her hoof slid off a small ledge she was holding on to, and she yelped in fear. It had fallen from it's place, making a small sound as it hit the ground below. Shimmer lost her grip on the rocks, but she was flying, so she was safe, but quickly she realized neither her, nor her sister were safe. The ledge's movement began a cave in.
-----
Sizzle was laying down in her bedroom like normal.
She wanted to fall asleep, but at the same time, she wanted to be as awake as possible. Her sister had gone to see what the world outside was currently like, to see if they could leave. Sizzle wanted to be safe, but she was getting bored of her bedroom that was this section of cave.
Suddenly, a loud sound like rocks falling onto rocks echoed across the caves. Pebbles began to fall from the roof of the cave, and Sizzle's eyes widened as a larger rock fell across the room. A boulder. Ten years worth of pain and nightmares and terror flashed across Sizzle's face, and the worst part was she knew it was a memory, not a nightmare. Sizzle wasted no more time, instantly on her hooves and running through the entrance, or, now, exit to her room. On her way to the place she had fallen with a boulder on her wing, she almost crashed into Shimmer.
"We have to go!" Shimmer said faster than lightning, terror in her voice."We need to go, we have to go, NOW!"
-----
They ran together, right to the place where they fell, their exit to the falling cave. "Next to me, Sizzle!" Shimmer demanded. Sizzle quickly
moved next to her sister, as Shimmer created a magic shield around them.
She picked up Sizzle using her magic, and flew up the now larger hole to freedom. She flew as fast as her wings would let her, trying desperately to escape the cave. A large chunk of rock prepared to fall on top of them and crush them. Sizzle screamed. The rock fell onto the shield, which was bending in like it couldn't hold the boulder. Shimmer's horn sparked and lit up with tons of power, as she controlled the shield and forced the rock off, throwing it backwards onto the wall, which crumbled as the cave collapsed faster.
They finally flew free, out of the cave. They quickly spotted beautiful mountains, and a lovely pine forest beneath them. Also beneath them, was a large potion of the ground, crumbling into a now very large hole that was their home once. They could never go back to their hiding place again. They landed down, away from the large hole that had finally stopped crumbling the land around it, and caught their breath. They were gasping for air like they were under water for an hour, terror on their faces. Silence. Neither sister spoke.
"Well," Shimmer finally broke the silence,"No chaos, except for that hole, which wasn't started by Discord. Everything is fine!"
They both fainted together on the soft grass of the pine woods.