A man wearing a mask with a suit came out of a wall in the back of the Pricilla's residence..

When he stood up, his eyes turned purple.

He was watching Al walking towards a bathroom about to change his clothing.

The masked man ran in the bathroom and threw a potion that knocked Al unconscious.

…..

When Al woke up, he was sitting on a black room with a light on him.

Suddenly, a moving TV screen showing the masked figure moved in front of where Al was standing.

The masked man pointed towards the right which Al obviously followed.

What he saw made him sick to his stomach.

There were multiple monitors that were showing his bro Subaru dying over and over again.

When Al turned back with rage he then jumped back out of shock as the Masked Man looked towards him without the monitor.

The masked man offered his hand and after 5 seconds, Al shook it.

The camera then shows Al being given a device which made him transform into Betelgeuse.

When "Betelgeuse" exits the room, he notices that he is in a school.

However, he knew what he needed to do with the masked man's plan.

The camera then shows something that made the entire class feel sick.

Every 3 seconds, it shows how the masked man kills the witches.

Subaru knew the witches as they were from his world.

Meanwhile, it shows various scenes of "Betelgeuse" hiding while watching previous Isekai Quartet moments.

It then shows a camera to a grass field where Echidna/Satella is shown about to open a strange door.

She doesn't not realize that a certain masked man was behind him holding a purple device.

Before Echidna could turn around, the masked man jammed the purple syringe in the back of Echidna.

This caused the witch to start spilling blood from her entire body until she was just a corpse.

The masked man then laughed and then dragged the dead body of Echidna through the weird door she saw from the start.

Al, who turned back to his correct from after he did what he had to do as Betelgeuse, came out the door as well.

Al and the masked man grabbed her by the arms and dragged her towards a hanging chain.

They put the girl's limp arms around the chains.

They both look at the chained-up corpse.

They both took off their helmets/masks to reveal….

RINTARO OKABE AS THE KNIGHT AND NATSUKI KENICHI AS THE MASKED MAN.

They both then looked towards the camera with the biggest shit eating grins on their faces.

The video then ended.

The class were in shock at what they had just saw.

….

If you are wondering where this idea came from, go to this video dhuTwCO2qKE and go to the 1:48:00 minute mark.

Also make sure to join the fanfiction discord server with this code: FEEDqZ3R