The Downfall Hero

Chapter 10

All Might busts down the doors of the USJ. "Fear not students." He rips off his neck tie. "For I am here!"
Izuku looks up at All Might, worried. 'He's not smiling.'
Shigaraki is extremely confident. "I've been waiting for you, you piece of heroic trash." The villains in the crowd shuffle nervously, ready to either flee or fight. All Might makes the choice for them by taking them all out before most people in the building could blink. He quickly picks up Aizawa and the students closest to Shigaraki in the same amount of time. 
Setting them down a short distance away, he glares at the boss duo.  "Take Aizawa. He's out cold, so be quick!"
Shigaraki mumbles under his breath, picking his dropped hand and setting back on his face. "State sponsored violence. How typical. You know, you're fast, but not as fast as people say. So, I guess its true." He sends them an evil stare through the fingers of his hand. "You're getting weak."

Izuku takes the time to warn All Might. "All Might, look out for that brain villain! I threw a punch at him and it did nothing. I didn't break my arm, but he didn't even flinch!"
All Might flashes him a smile and a thumbs up. "Thanks for the heads up Young Midoriya. Fear not." He crosses his arms and dashes at Nomu. "Carolina Smash!" Nomu is unfazed and lunges at All Might, who quickly limbos under the attack. Taking that as his cue, Izuku picks up Aizawa and quickly runs alongside his companions. 

They're almost at the stairs when he looks back. 'He knew. He knew All Might was getting weaker. I'm the only one who knows that. Which means they either had an analyst go over All Might's recent history or' he freezes 'they have inside information. They might know about his injury!' He sees All Might get trapped in a portal. 'I have to help.' He palms off Aizawa to Tsuyu. "Take Aizawa for me." Without hesitation, he starts running towards the villains. "All Might!"
The portal villain appears in front of him. "Not so fast." Its too sudden for Midoriya to turn. Thankfully, he's saved by his best friend. "Get out of here, you smoky bastard!" Bakugo uses an explosion to disperse the vapor and pins the villain's physical body to the ground. Ice encases Nomu's entire side and Kirshimas lunges at Shigaraki who dodges.
"Kacchan, you guys." The now four hero students outnumber Shigaraki and Nomu, who has his grip loosened enough for All Might to escape. 
Shigaraki looks at Bakugo. "Well, that's a problem."
Bakugo grins down at the mist guy. "You're not made of this misty stuff, you just use it to hide your body. Fool me once, shame on you."
Shigaraki seems mostly unfazed. "Nomu, take care of the blonde one. I'd like Kurogiri back." The massive villain passes back through the warp gate, the strain on his frozen limbs causing them to fall apart.
Kirishima goes a little green. "Oh man that's gross."

When he starts regenerating, Izuku is shocked. "I thought his quirk was shock absorption!?"
They could hear the victory in Shigaraki's voice. "I didn't say that was all he could do. He also has hyper regeneration. He's a living sandbag that can take anything you throw at him." It lunges at Bakugo who suddenly appears by Izuku and Todoroki's side. 
"Woah."

Nomu and All Might start throwing hands with everything they have, with shock waves being made by the force of the impact. Despite the situation, All Might sounds confident. "You said 'absorption', not 'negation' so there's an upper limit? Made to take everything I have? Then I'll go beyond!" The symbol of peace and his opponent starts punching one another hundreds of times in seconds, creating gale force winds. "I'll go beyond. Plus," He winds back a finishing blow "Ultra!" The creature is sent flying through the roof of the building and disappearing into the clouds. 

Everyone is left in shock and awe. "It's just like in the comics."
All Might smiles wider, having won. "What say you, evil doer? Care to 'clear the game'?"
Shigaraki starts scratching his neck almost violently. "It's not fair. You cheated. You haven't weakened at all. They lied to me"
All Might smirks. "What happened? Can't walk the walk?"
Izuku looks at All Might, worried. 'He's bluffing. The steam he makes when he debuffs is mixed in with the dust. If the villains don't leave, he'll die. I have to scare them off.' Using OFA, he launches himself at the portal villain, hoping to smash him. He feels a lot of pain in his leg. 'Damn backlash.' He winds back an arm, but a portal opens in front of him, a pale hand passing through to grab him. Before it can make contact, a bullet passes through it. Looking at the entrance, Izuku sees a collection of pro heroes at the top of the stairs, Snipe's gun smoking.

Shigaraki huffs. "Its game over Kurogiri. We'll have to try again next ti- gah!" he's cut off by a hail of bullets and Kurogir starts getting dragged into Thirteen's black hole. "I may have failed today symbol of peace, but when we see each other again, you're dead meat!"
Izuku sighs as Shigiraki disappears into the warp gate. He looks up as he dust clears to see a partially debuffed All Might, a sly grin on his face. "Looks like you saved me again young Midoriya."