The Effort to Stop

Twilight rushes out of the room, and immediately rushes into every chamber of the castle, which has now all been changed into torture chambers, and orders the castle guards to stop the torture and treat them for their injuries. However, as she opens one of the rooms, she stares in utter disbelief.

She sees Applejack and Fluttershy tied upside-down by a barbed wire covered in blood.

"Applejack? Fluttershy? you guys are-"

Then she notices all of her remaining friends; Starlight is being caged in a metal cage with acid dripping all across their body, Spike being waterboarded using ice-cold water while being forced to swim inside of liquid nitrogen, Rainbow Dash having her wings being chopped off using a hacksaw, Pinkie being suffocated using balloons, and Rarity being rotated in a breaking wheel while her flank was being poked using hot pokers.

"Are you guys all-"

She is stopped by Rarity, who says in a crying voice:

"Please oh Princess of Darkness, please let us go. I am sick of this pain, My hooves are twisted and my flank has been melted by hot pokers. Please!"

Twilight nearly faints after seeing her friends in such a bad state.

"I.. I can't take this!"

She then takes up a piece of glass, and stabs herself multiple times, before crying out loud:

"Release them! Release them immediately!"

The guards are in complete shock, as this world's Twilight has never asked anyone to stop the torture of her "friends". She would set other ponies free in return for slavery or heavy-duty work but never listen to their pleas. Regardless, the guards set them free and they all fall limp on the floor, mainly due to their injured bodies. They then take all of them including Twilight, but Twilight stops them:

"I don't need medical treatment, they need medical treatment!"

A now injured Twilight then leaves the room and continues entering more rooms, freeing more ponies, until a single room catches her eye:

"The Room for the Fucking Royals?"

She then enters the room, only to see Shining Armor in chains, Cadence being beaten using a machete, Flurry Heart is being starved, and Celestia and Luna being forced to hurt each other. Even before anyone can say anything, she exclaims:

"Set them free!"

The guards are again in complete shock, but they do it anyways. Twilight then continues through the castle, releasing more and more ponies, and after nearly six hours after entering this world did she finally finish. She then decides to take a stroll outside the castle, with a disguise that is:

"Hey mate, how much do these apples cost?"

"Five bits per se."

"I'll take two!"

"Wait, you must come with me first, I have something to show you!"

Twilight follows the shopkeeper, as he leads the path ahead:

"Haven't seen you around here for a while, are you new here?"

"Well yes of course, you know, I used to live in Canterlot, just came here to visit my family!"

"Eh, having a peaceful time here, not being bugged by the princess, uh right?"

"Yes, having a great time here, well uh, where are we going anyway?"

She says as they turn a corner into an isolated alley:

"To get robbed that is! (Maniacal laughter)"

He brings a knife out of his pocket, and holds it against her neck:

"Give me all the bits you have, or else.. Get ready to be decapitated!"

Twilight then takes off her hood, to reveal herself:

"Princess Twilight Sparkle, I.. I.. uh.. Please forgive me, I'll never do anything like it again!"

"Oh you will be punished, for you have passed your limits!"

The shopkeeper's face turned pale, as he knew what his punishment will be:

"No please, your punishment is painful. I've seen first hoof how-"

"Not that kind of punishment, as I am not your Twilight."

"Wait, what do you mean by that?"

"I entered this world because I accidentally added a few lines to a time spell that I tried casting to go back in the past."

"Our Princess was cruel and manipulative, she used to treat us like toys."

That's when the realization hit Twilight:

"That means, if I'm in this world while this world's Twilight is missing, that means she is right now in my world causing mayhem and trouble, meaning if I ever even can return to my world then I will be hated and disgraced by everyone there!"

"Please don't leave, at least help us save ourselves from our Twilight when she returns before leaving for your own world."

"Okay, that's a deal, but you must promise to never rob anyone again."

"I promise, and again, thank you for your help."

"You're most welcome. Now let's get started!"

"Also sir, what's your name?"

"Fierce Gold."

"Also I only used to rob people to make ends meet."

"Don't you have the apples?"

"You know, in these times, everyone hoards staple food, and not mere snacks like my apples."

"Oh okay, that's fine.. actually not fine by me, even if it is used to make ends meet."

"You're right, I shouldn't have robbed these people anyway, but in this Equestria there is no law and order."

"That's not good."

"It isn't, but we can do nothing either. Also, I feel bad for the people I have robbed, they did nothing to me, and all I did was steal their life savings by force."

"I think you should go ask an apology for as many victims you remember and try your best to repay the stolen money."

"I can't, the princess has set an outrageous amount of over 1,000 bits per pony to live just one month in Equestria. And those who fail to pay the taxes will be locked up with the other prisoners in the torture cells. "

"Can't you all just, like, go to other lands, like, the-"

"We can't, the princess has conquered and destroyed those lands, and held the ponies who fled there hostage for their supposed "betrayal", though many ponies did manage to escape."

They hear the sounds of collapsing buildings in the distance:

"We need to hurry, now!"

"There is only one creature that can help you."

"Who?"

"King Centaur."

A new being?

"Where can I find him?"

"King Centaur, the king of the ursas, has been captured and locked away in Tartarus, with the door being locked with a special padlock that only the princess can open."

"Since you are the exact copy of our princess, you maybe can open the lock?"

"I don't know, maybe, I can try."

"But you'll need to show me the way.'

"This world's Tartarus is located atop Mount Aris. It was moved after an infiltration attempt by the three races of Equestria. It has since been protected by a magical force field that alerts the princess if anyone tries to break through. Since you're the princess, it really won't matter if anyone tries to break in."

"Okay then, let's save all of you!"