Katsuki and Izuku got on a training mission sith the rest of their class, but since the war, villans have either been too scared to face them, or their ego is too big and they'd attack them. Which is what just happened. A group of 5 villans came up and split them up. The main villan's quirk is 'knives' they can make a knife come out anywhere on their bodies. Not to mention they have really good combat skills. Katsuki on this hand, showed up late because he had to go to the doctors to get his heart and armed checked out, to see if everything's doing well. Katsuki walks in to a early quiet training session. Nobody there. Then he hears a few explosions, so he uses his quirk to boom over with his left arm. He lands near the explosion and sees Izuku fighting the villan. And Ochaco is up in the air helping. They both then see the knife stab into Izuku's side. Izuku doesn't have a quirk anymore. So he cant defend himself as much. Ochaco quickly floats down and makes the guy float, and Katsuki, out of rage, Explodes over and smacks a Explosion in the villan's face.