After the attack at the forest training camp and Bakugo's kidnapping, at the bar. In this AU, the student's don't try to rescue Bakugo.

Shigaraki: Bakugo, why not join us? It's a lot of fun...

Bakugo: I'll never join you! I'm a hero and I'm gonna kill you all! Just watch! I'm gonna blow up all your faces and turn you into ash!

Dabi: How?

Toga: Yeah, you're all chained up…

Bakugo:

Toga: Can I please cut him? Pleeeeeaaaase!

Deku enters from a corridor.

Deku: No. We don't want to hurt him unless we have to.

Bakugo: Deku?!

Deku: Hi Kachan!

Bakugo: You're not Deku. Deku would never side with villains.

Deku: Why not?

Bakugo: Because that loser wants to be the number one hero.

Deku: You're wrong. I want to be the number one villain.

Bakugo: Yeah right. All stupid little quirk-less Deku wanted was to be a hero.

Deku: That was once true, but… things change.

Bakugo: SHUT UP AND STOP PRETENDING TO BE DEKU. BASTARD. YOU DIDN'T EVEN GET IT RIGHT! HIS ARMS WERE BROKEN WHEN WE LEFT THE CAMP.

Deku: Yes, they were. Father gave me this great healing quirk though. It helps a lot with all the damage I can get in a fight. I just have to be careful not to use it without going to recovery girl first.

Bakugo: SHUT UP YOU LYING BASTARD!

Deku: You really need to control your temper. Join us. Then you can let out all your violence against the city.

Bakugo: I'LL NEVER BE A VILLAIN!

Deku: Why not? You've already done villainous things.

Bakugo: NO I HAVEN'T. I'M A HERO!

Deku: Don't tell me you've forgotten? What a shame. Shigaraki, what should we do? It doesn't look like he's going to join the league anytime soon, and the heroes will probably come looking for him. I'll lose my cover.

Shigaraki: Don't worry. Kurogiri, warp him to the room.

Kurogiri: Right away.

Kurogiri warps Bakugo to secret room with no entrance or exit, deep underground. The only way in or out is with come kind of transportation quirk.