The Bloodstained Blade

Breakout

Aizawa thanked Momo for the device she gave him. In her quick thinking, she'd put a tracker on one of the villains that escaped, and they now had their location. Plans could be made, and people saved. Izumi, as much as he didn't like her past actions, was just as deserving of rescue as any of them. Just as they were about to head back, the patchwork villain crashed past them onto the ground, beaten and broken way worse than when they found him. After a moment, Momo was the first to speak. Horrified at what happened to him, and not comprehending... "What..."

Then... they felt the aura of The Blade. Aizawa recognized it immediately, the shroud of malice present within every high tier villain, while Momo was terrified, her mind not yet comprehending what her instincts told her. Then they saw him. His ruby eyes blazed with an innate hatred for him, far beyond anything he held for Izumi and Bakugo, and he was slowly walking towards the ragged man on the floor. The villain didn't respond to the encroaching threat. Only Aizawa stepped between them. "Izuku, what happened?" The pink haired boy didn't respond, instead keeping his gaze exclusively on the villain. Harsher, this time, Aizawa asked again, only saying his name. "Izuku!" He had to physically restrain the normally calm Izuku, asking for the third time.  "Izuku, stop! Why?"

He could finally hear words. Focusing on them, Aizawa realized that it was Izuku, muttering under his breath, a ferocious and threatening set of words. It exposed his core, and the underground hero now knew why he snapped. "He insulted her... threatened her... he can't be allowed to live..."

"Threatened who? Izuku, talk to me!"

This brought his attention back to Aizawa. Narrowing his eyes, Izuku growled a simple ultimatum. It dripped with more malice than he'd ever heard from the boy before, and it was clear that this was a deathly serious matter. "Get out of my way."

Eyes widening in shock, he braced against him, "Not if you plan on killing him!"

"Then I have no choice." He jumped back and threw something at the ground in front of Aizawa. The potion of weakness combined with his fatigue from the night's events made him fall to his knees, unable to move, never mind stop him. Momo then got in his way as well, swallowing her fear, showing true courage in the face of a lethal opponent. "Please, this will make you look really bad to everyone."

Breathing deeply, he sighed, and slowly blinked. "Relax... he's out like a light and I was just going to give a quick health boost so he doesn't wake up... I want him to feel the pain I give, so that when he goes to hell, the devil will have to actually think of something new to give him." His grin sent a shiver down her spine, and she begrudgingly let him go. With a sly smile, all he said was, "Good girl." Before throwing the potion onto him, and she watched as the wounds healed much faster than they normally would. Faster than Recovery Girl. How was that possible? However, she couldn't ask, as her 'teacher' asked her: "Alright, can you make some restraints?"

In a flash, she created a standard tool for modern heroes... and just what he was looking for. "Here, quirk suppressant handcuffs."

"Thanks." He cuffed him to a tree and waited for everyone else, his bloodlust satiated for now... although he was irritated by the voices still demanding blood. Although nobody else could hear them, he stayed by himself for the rest of the day to deal with them.

On the way back, Dabi woke up with Izuku looking at him, thinking. They were in the back of a secured police van, and nobody could hear what was said on the inside. This was for two reasons,  "Well, that's creepy."

However, it was clear that he was still under the pinkette's ire, as his voice was completely serious. "What is his next move?"

Sneering, and still hurting, the man stated, sneering at him. "Like I'd tell you."
Unblinking, the Blade told him what exactly would happen next if he failed to comply. The smile on his face affirmed that he was both telling the truth... and relishing in the despair caused by it. "I want you to know that I can convince Nezu to hand you over to me, making you subject to myself during your stay in captivity." Pausing for a moment, the truck shook, allowing the ravenette... or rather, they dyed haired man to take in the information. "I could just let your secret out, and hand you over to Endeavour... they'll all be so happy to see you!"
That jarred him, shaking his resolve of spite and hate, even if for a moment. "You would traumatize your student." Taking a breath, he resumed his mask, only for neither side to believe it. "You wouldn't want that, would you?"

Izuku shrugged, not too disturbed by the line of thought. After all... he would rather break himself than listen to anyone about protecting the innocent. He would die if he didn't change, and that was one method to do so. At least, if he was planning to stay at UA. "Shoto needs to grow. He won't do that sheltered by a delusion. I would be happy to break it, unless... you tell me what I want to know."

Glancing around, he asked. "Tsk... nobody can hear us, right?"
Leaning back against the wall of the vehicle, the pinkette continued to smile. "No. This model of police van is soundproof, so that prisoners don't get any ideas from outside events."
Dabi sighed, a moment of silence, before speaking once more. "The boss man wants to get in contact with the Yakuza, steal their information, and destroy what they're making."

Nodding, Izuku put the pieces together. "It's a direct threat to him... of course. This makes it even more important to kill him as soon as possible. I have to accelerate my plan... and I cannot stay at UA any longer..."

Only then did he notice the cuffs around Izuku's hands. He was supposed to be a teacher. Why was he even arrested like him? It made no sense. "Why are you cuffed?"
"I may or may not have beat you so hard that they had... concerns..." He smiled. Holding up his arms, he showed them the default quirk cancelling cuffs, "This was their precaution..." the cuffs slid off his hands as he spoke, "That failed." He checked the back door, found the locking mechanism, and forced it open. Turning back to Dabi, he laughed. "You don't get to leave. This is my stop. Tell Nezu, if you have the chance, of course, that the games are over. Next is only the beginning, and if he wants to minimize the damage, stay out of my way. Got it?"
All of this was happening so fast, that the pyromantic villain could only ask: "What...?"

Izuku pulled out a crossbow from his inventory, and before the raven haired man could react, shot him with an arrow in the knee, pinning him to the chair. 

Why do I feel like this is a skyrim reference?

I used to be an adventurer like you, until I took an arrow to the knee.

The fact the bolt went through a metal bench was more than enough to put the next point across. "That is for what you said before about Tenka. If you continue on that path, I will make the rest of your life a living hell. Don't make my problem become yours." His grin remained sinister, even with the wind pulling at his cloak, and his long, pink hair. "Remember, nobody can hear you scream... when I'm finished with you. Have fun, Touya..." He grinned as he leapt back, through the door, and out to the street, rolling to his feet fluidly. Turning back, he watching the truck drive away for a moment, then strode left into an alleyway. Time to locate a resident plague doctor.