Shoto appears suddenly, scolding Izuku for not explaining the urgency of the situation because he could have gotten there sooner. He explains that it took him a while to decode Izuku's message since he only sent his location. He sends a wave of ice at Stain to repel the villain while securing his injured allies. Shoto also notes that he realized Izuku must have needed help and not to worry because pro heroes are on the way. F/n kept his stance with his arm slightly visible as it was violently vibrating. Stain takes a step back as he knew F/n was the son of the powerful hero, which is her mom.

As he continues to push Stain back using both his ice and fire, Shoto warns the hero killer that he will not allow him to kill his friends. F/n stood by Shoto to protect Native, Izuku and Tenya.

-Reader-

"I'm right here with ya Two-Face."

Shoto:"Thanks, Speedy."

Izuku then warns Shoto and I not to allow Stain to ingest his blood and Shoto decides to keep his distance while I on the other hand just kept moving super fast so that voldemort fucker can't catch me.

"Can't hit a moving target!"

However, the Hero Killer quickly throws a knife at Shoto, who narrowly evades it and has his cheek cut open. The Hero Killer rushes Shoto and is blocked by a pillar of ice, in support, I kicked him which pushed him back again, howbeit he tossed his katana in the air at the same time to distract his foe.

"Shoto! Watch out!"

Abstracted, Shoto nearly allowed the Hero Killer to lick the blood from his face but I grabbed his face and jabbed my fist into his stomach.

Shoto:"Thanks for that, almost froze me."

"That's your job."

Shoto counter attacks with waves of ice, but Stain grabs his katana to defend himself and commends Shoto and F/n for their strength.

Hero Killer:"You two are gifted.."

What went down....

Tenya pleads for Shoto to stop because he's inherited Ingenium's name, and only he should stop the hero killer. Withal, Shoto replies that Ingenium never had the look of vengeance plastered on his face.

Shoto:"He never had that look when he saw the Hero Killer..."

He creates a giant wall of ice, but Stain slashes through it and tells Shoto that it's foolish to block his own view when his opponent is father then him.

Then Stain stabs Shoto's left with two throwing knives and moves above him. Just as he's about to stab Shoto from above, Izuku unexpectedly grabs him and tackles him away.

Shoto guesses that Stain's Quirk may have a time limit, but Native explains that Izuku was the last to suffer from it, so that cannot be the case. Izuku comes to the conclusion that Stain's power's effectiveness varies depending on blood type, to which the Hero Killer confirms.

Izuku and F/n resolves to distract Stain while Shoto supports them from behind since the former has already shed so much blood. Although reluctant to the risk, Shoto agrees to protect Tenya and Native together with Izuku. He recalls worrying about Tenya ever since Ingenium was attacked because he recognizes someone who's acting on pent-up resentment. Shoto also knows too well how that negativity can cloud someone's judgment.

Shoto recollects visiting his mother, and how visiting her cleared up his own perception. He told her everything that happened and so she apologized and forgave Shoto for not visiting her for a long time. She also encourages him to move forward in his life without anything holding him back, as that would be her salvation.

That's why he decided to intern with Endeavor's agency, not because he has forgiven his father, but because he wishes to learn from the experience of the number two hero. Shoto realizes that everything could have been simpler for him, but never noticed until Izuku opened his eyes with just a few words.

With the intensity increasing, Stain heightens his strength and overpowers Izuku. He cuts open his leg and licks the blood to paralyze him, F/n just dashed to Izuku with Shoto who supports him, but Tenya again pleads for them to stop.

Shoto rejects his pleading, and tells Tenya to stand up and look properly at who he wants to become. Stain slashes through a wall of ice and goes to attack Shoto, who responds by releasing his fire. After Shoto tries to save Tenya like Izuku had done for him, Tenya reflects shamefully on himself and starts to move his hand. F/n kept dodging attacks coming from Stain as the bloodlusted villain cam with a barrage of slashes. F/n didn't have time to dodge another one since he forgot about his other arm which caused him to have a large gash on his chest. The gash made his muscles tissues and a bit of his ribs.

Izuku screamed F/n's name as the speedster fell on the ground kneeling. Blood pouring from his mouth and a very large wound.

-Reader-

Izuku:"F/n!!"

"Ugh..."

Mom:"B-baby?! Stay awake for mommy! Come on! You're Quirk will soon kick in so just stay awake for me dear!"

I heard my mom scream inside my head as my vision become blurry and foggy. I winced at the pain as my blood poured on the pavement.

Hero Killer:"Shame, I'm sorry to kill such a potential filled young man as yours."

He raised his sword and swung downwards. But before his blade made contact with my head, I blocked the sharp end with my hand as it began to bleed.

"Y-you think I'll go down this way..?"

I look at him with the smile I would always see at All Might and Izuku. My left eye was slightly half lidded from the slowly slipping away of my conscience.

"Think again....bastard..."

I threw a powerful punch which sent the bastard back as I felt my body began to get slightly heavy. It turned out that the Hero Killer ingested my blood.

But something was strange about me, I was able to power through his Quirk as I stood up.

Hero Killer:"How are you still standing?!"

He looked at me with slight fear as I limped towards my goggles. I picked them up and wore it around my eyes before looking at the no-nose bitch.

"I'm special..."

Meanwhile...

Shoto encourages Tenya to never forget the man who he wants to become. Ashamed to have caused his friend's injuries, Tenya recalls memories of years ago when Tensei became the motivation for him to become a Hero. Shoto continues to try and force Stainback, prompting the villain to comment that the young man relies on too heavily on his Quirk in combat.

Tenya comes to the realization that Stain was correct in stating that he isn't a true hero and decides that he must stand up if he wants to become a true aspiring hero like Tensei, Izuku and Shoto. Just before Stain slashes Shoto with his Katana, it breaks thanks to Tenya's Recipro Burst enhanced kick. F/n punched Stain on the cheek and kneed his stomach.

Tenya apologizes for getting his friends involved, but Stain refutes this and states that Tenya will never reform into a true hero. Shoto tells Tenya not to listen to the villain's words, but Tenya agrees that he isn't a true hero. Nevertheless, Tenya believes he can't give up or else the name of Ingenium will die.

Tenya intercepts one of Stain's throwing knives targeting Shoto, then asks his classmate to freeze his radiators. Stain pins down Tenya using another knife and Izuku regains his mobility. F/n struggles to activate his Quirk but soon makes delayed vibrations in his molecules.
(True Fact about Quicksilver)

-Reader-

"Molecular Control: Tectonic Vibrations!!!" I shouted as Izuku and Iida activated their special abilities.

Izuku:"One For All: Full Cowling!!"

Iida:"Recipro: Extend!!"

We all jumped at the Hero Killer with incredible speed at once.

-Tenya-

"Use my leg..."

-Izuku-

"Use my arm..."

-All of the three-

"That's all we need, to finish you!!"

-Reader-

"Rahhhh!!"

I screamed before smashing both of my fists to the Hero Killer's head as Tenya and Izuku got both of his face.

Shortly after...

Shoto restrains the defeated Hero Killer using rope and Native carries an injured Izuku out to the street. Gran Torino meets them there and berates Izuku for leaving the train against his wishes. The other Pros arrive to call an ambulance for the injured and the police to arrest the Hero Killer.

Tenya takes a moment to apologize to his friends for getting them mixed up in the fight. Even helped F/n getting up due to his slowly healing wound as the speedster removed his goggles. Then suddenly the last Nomu swoops down from the sky and snares Izuku. Before it gets too far away, Stain recovers and uses his Quirk to stop it. Then he saves Izuku by grabbing him and stabbing Nomu's brain.

In spite of being heavily injured, Stain states that...

Stain:""fake" pro heroes and the pathetic criminals in society must be purged to create a more just society..."

Everyone is taken back by his actions and Endeavor arrives. Stain is enraged by Endeavor's arrival and challenges all the heroes to try and defeat him in battle. F/n pushed himself away from Tenya and walked in front of Endeavor.

The bandages over his face fall off and Stain releases a malicious aura that paralyzes everyone with fear, even making Endeavor step back. F/n didn't get phased by his aura but instead, he fought it back with his own, more terrifying, glare. Causing the Number 2 hero to get impressed.

The Hero Killer prepares to attack, but his perforated lungs cause him to lose consciousness. Even though he was incapable of fighting, Stain was the only one left standing to face his opponent. F/n also fell unconscious as he fall to the ground with blood still pouring out of his chest.