As Midoriya and Todoroki prepared to defend Iida and Native from the Cyclonian Killers, Shigaraki and Kurogiri held a meeting on the Reaper. 

Shigaraki: Kurogiri. Are the Nomu ready? 

Kurogiri: Yes Tomura. Doctor Skaal has assembled a squadron of powerful Nomu. They've already been sent to Terra Musutafu. Shall they proceed?

Shigaraki: Give them the order. I want that Terra flattened. But more importantly I want those Cyclonian Killers killed.

Kurogiri: I shall give them the order at once. 

Meanwhile, Midoriya and Todoroki confronted Stain and Dove. Dove soon realized that a tougher fight would be ahead.

Stain: Remain calm Dove. 

Midoriya: Why are you attacking our friend?!

Dove: He was unworthy of the title of Sky Knight. Instead of living up to his duties as a Sky Knight, he selfishly pursued us for the goal of revenge!

Midoriya: You attacked his brother! You nearly killed him!

Stain: He gave us no choice.

Todoroki: So murdering Sky Knights because they don't fit your image is a justified action? 

Stain: False Sky Knights are the same level of scum as Cyclonians. Atmos will never truly thrive as long as both exist. 

Iida: Go! Save yourselves! I....I'll only be a burden! 

Native: He's right! They're....too powerful!

Midoriya readied his Energy Blade while Todoroki readied his Dual Energy Spear. The Cyclonian Killers readied their blades for an intense battle against the Sky Knights. 

Stain: Dove. You take the left. I'll take the right. 

As Stain relayed his plans to Dove, she charged at Todoroki and began attacking him while Stain went for Midoriya. Dove slashes at Todoroki with her wristblades, but Todoroki was able to block the attacks with his spear. 

Todoroki: So you must be Dove. The Storm Hawks told us about you. 

Dove: That doesn't matter Sky Knight! All that matters is the mission! 

Dove continues attacking Todoroki. Meanwhile, Stain meticulously attacks Midoriya. 

Midoriya: You're not getting away with this!

Stain: I will give you one last chance Sky Knight! Walk away or I will be forced to kill you!

Midoriya continues to fight off Stain's attacks while Todoroki fended off against Dove's attacks. The two Sky Knights were able to hold their own against the Cyclonian Killers. Stain in particular was deeply impressed with Midoriya's conviction. He saw in Midoriya the essence of a true Sky Knight. Something he saw in only All Might himself. 

Stain: You have strong conviction Sky Knight. While you defend unworthy scum, you however hold true to the duties of a Sky Knight! 

But as the Cyclonian Killers fought against the Sky Knights, the ground began to shake. They all looked to the horizon and saw smoke. 

Midoriya: What's going on?!

As the Sky Knights were preoccupied with this, Stain turned to his apprentice.

Stain: Go.

Dove: What?! No! I'm staying with you!

Stain: Go back to the hideout. You must continue the mission. No matter the costs.

Dove was conflicted. While she wanted to stay by Stain's side and fight both the Sky Knights and whoever was attacking Terra Musutafu, Dove was obligated to obey Stain's wishes and retreat back to the hideout. 

Dove: Will I.....see you again?

Stain: That doesn't matter Dove. All that matters is the mission. 

With a grim look on her face, Dove retreated from the area. Stain was now left with the two Sky Knights.

Stain: Sky Knights! 

As Midoriya and Todoroki turn their attention back to Stain, they notice that Dove was gone. Before they could react, Stain attacks them. Despite the numbers against him, Stain was able to hold his own against the Sky Knights. While they fought, Iida watched. 

Iida: (Damn it! Damn it! He was right! I'm....I'm just a burden! In my own rage, I lost sight of what it means to be a Sky Knight! Now my friends are risking their lives for me because I got myself into this! I....I can't let them face that madman alone! I must fight! I must prove myself as a Sky Knight!)

Iida slowly got up. Despite the pain from his injuries, Iida got up and began running towards the group. Before Stain could react, Iida lands a punch on Stain, disorienting him. 

Midoriya: Iida!

Iida: I won't let you fight my battles! 

Stain: That was quite a hit. But it won't do you any good. You will die here. Like all the other fakes!

Midoriya: Iida! Todoroki! Launch a coordinated attack!

Todoroki then uses the fire side of his Dual Energy Spear to shoot out blasts of fire, forcing Stain to keep a distance. Stain was able to dodge the attacks. The fight soon began to be too much for him. 

Stain: (Damn. These Sky Knights are proving to be quite the challenge. Whatever's attacking the Terra will no doubt cause a problem. I have to finish this fight now!)

Stain readied his swords and prepared to lay out a final attack on the Sky Knights. Todoroki shoots blasts of ice from his Dual Energy Spear. This attack presents an opportunity for both Midoriya and Iida land a simultaneous attack on Stain, defeating them. As Stain lay unconscious, Iida turns to his fellow Emerald Sentinels.

Iida: Midoriya. Todoroki. I'm....I'm sorry.....

Midoriya: Don't be Iida. We understand. 

Todoroki: Iida. Are you able to fight?

Iida: I....I think I'll manage. What about you Native?

Native: I'm still a little sore from that fight, but I can help with whatever's out there. 

Midoriya: Right! Let's tie up Stain and leave him here! Then we go out and help fend off Terra Musutafu from the attack!

As Midoriya tied Stain, he led the Emerald Sentinels and Native to the attack to assist the Sky Knight defense.