Shouto has arrived, telling Izuku that he figured out his text message and came running to save him. Tenya is surprised to see Shouto and Izuku is shocked that Shouto not only came but is using his fire power as well
Shouto begins his battle with Stain; Shouto attacks Stain with ice but Stain dodges. Shouto launches a stream of fire at Stain only to be dodged. Shouto's attacks of ice and fire manage to bring Izuku and the injured Pro Hero to him; Shouto states to Stain that he won't let him kill them. Izuku warns Shouto not to let Stain draw his blood. Stain throws his dagger at Shouto's face and manages to land a cut on Shouto's face; Stain appears before Shouto and attacks him with his dagger, but Shouto blocks Stain's attack with a pillar of ice. Shouto looks up in the air and sees Stain's katana, becoming distracted. Stain grabs the distracted Shouto and prepares to lick the blood off his face. However, Shouto activates his fire power and knocks Stain back, preventing the Hero Killer from ingesting Shouto's blood. Shouto attacks Stain with ice again, but the Hero Killer dodges and slashes at Shouto with his katana and dagger, although Shouto is able to defend himself with a small wall of ice.
Tenya begs Shouto to stop fighting as this is his fight since he inherited Ingenium's Hero name, causing Shouto to criticize Tenya for making a vengeful, saying the Ingenium he knows would not make a face like his. Shouto creates and attacks Stain with great pillars of ice, attempting to block Stain's view. Stain cuts through Shouto's ice pillars with ease. Stain throws two small daggers into Shouto's left arm, causing it to bleed. Stain jumps into the air and prepares to stab Shouto with his katana. Izuku realizes that he can move and activates One For All Full Cowl. Izuku, using enhanced jumping speed, appears before Stain and grabs him, attempting to throw him onto the ground. The Hero Killer retaliates by knocking Izuku away with his elbow, causing Izuku to fall onto the ground. Izuku informs Shouto that he could have been released from Stain's Quirk due to either the number of targets thinning the effect, how much blood Stain has ingested or blood types; Stain praises Izuku for figuring out his Quirk has to do with blood types Shouto tells Izuku that avoiding close quarters combat and holding out is their best course of action against Stain with Izuku agreeing with him, telling Shouto that he will draw Stain's attention while he acts as support. Shouto states that they will protect Tenya and the Pro Hero. Tenya starts to feel regret for his actions as he has not been acting like a Hero should be.
Izuku and Shouto team up to battle Stain. Izuku activates One For All Full Cowl and tries to attack the Hero Killer, but Stain slashes at Izuku with his katana, causing Izuku's leg to bleed; Stain licks his katana and activates his Quirk, which paralyzes Izuku; Izuku apologizes to Shouto as Tenya tells them to stop. Shouto replies that if Tenya wants to stop them he must stand up. Now that Izuku is immobilized, Stain sets his sight on Shouto; he cuts through Shouto's wall of ice, removing Shouto's defense and prepares to attack Shouto. Shouto encourages Tenya to set his eyes on the man he wants to be. Tenya remembers that he wants to be like his brother, Ingenium and tries to break free of Stain's Quirk.