Flying through the air, Deku jumps around Overhaul in a deadly dance. He is almost on autopilot, unable to feel or see the world around him. All that he can see is Overhaul, that grotesque, ugly chimera of himself and his 'friend'. He can only see the sheer terror in Eri's eyes just minutes prior as the man nearly took her away.
He is blind to the world and he doesn't care.
When he opens his eyes again he is greeted to the sight of Eri passed out in Aizawa-sensei's arms. Overhaul must be down, and Deku smiles to himself at the thought. He pays no mind to his teacher speaking to him, his hand just a hair away from the boy's shoulder.
He glances around, finding Uraraka and Tsu. Uraraka is on her knees and hands, heaving stomach acid. Tsu stares at Deku with dead eyes, holding on to Uraraka's hand and keeping the girl's hair out of her face.
'Drip, drip, drip'
Deku looks down to see his hands covered in blood. There are pieces of bone and flesh in it, the disgusting slush slowly moving down and running off his fingers. It falls down and onto the pavement slowly and mixes into the gore already there.
Following the trail of blood, bone, and muscle, Deku sees the limp body of Overhaul. More flesh and bone litters the pavement around him, painting a grotesque picture. That isn't nearly as bad as the man himself, though. His body is bent at odd, unnatural angles, his back almost at 90 degrees. What remains of his upper body, that is. There is what looks roughly to be a hole in his left side, if you could even call it that. It is more ripped apart than anything. The 'hole' spreads from his mangled ribcage to his hip, bones jutting out of torn muscle and intestines spilling onto the torn up road beneath him. Some are oddly clean, as though something ripped everything off of them. Others still have pieces of skin and flesh hanging off the broken tips or clinging to the sides in a bloody, gory mess. What looks to be his stomach and liver lay a couple feet away, the stomach acid eating slowly through the flesh it landed on. That still isn't even the worst part, though.
Broken pieces of concrete are jutting horrendously through his body, only serving to mangle the man further. There is one particular, thin strand that arched from a wound in his torso in the form of a lasso of sorts, strands of intestines, blood vessels and tendons strung from the bottom to the top like it is supposed to be some grotesque imitation of a harp. The wind pulls at those 'strings', causing them to move and give out slightly squelching sounds as they further mutilate the flesh they were still stuck to.
Is he breathing? Is there a chance? There is movement, however slight, it seems he just might be alive somehow. Deku runs to him and skids on the pavement, staining his uniform a reddish brown. He can't be dead. There's no way that he killed him. He may be a horrible person, but that doesn't warrant his death. Does it?
Heroes don't murder. That's what villains do. Deku isn't a villain.
His sight of Overhaul begins to blur, but he can still see sightless golden eyes staring at him. Holding his hand over Overhaul's bloodied mouth, he waits. His logical reasoning knows that heias dead, that there is absolutely no way that he is still alive, but Deku doesn't care. He doesn't want to be able to say he killed someone. No matter how vile, how sickening of a man Overhaul was, he doesn't deserve to die.
Eventually, he has to face facts. Overhaul is dead. He is dead, and Deku killed him. The blood on his hands and Overhaul's lack of breath confirmed it.
A strangled sob tears from Deku's throat and he has to throw up. Bile makes its way up his throat and he turns to the side so that it wouldn't get on himself or Overhaul. Red hands grip green hair as he screams and chokes broken apologies.