Seeing that Katsuki is the one being attacked by the villain, Izuku rushes to his aid. Remembering the notes he took by observing heroes, he then throws his bag at him and tries to grab Katsuki, but the enemy stops him from doing so. Katsuki then yells at him, question why Izuku is there. Izuku says there are could be lots of reasons, but it was because Katsuki's eyes were pleading for help.
Stunned with Izuku's actions, All Might questions himself, saying that he's pathetic for forgetting that a pro must always put his life on the line. All Might then uses Detroit Smash to defeat the enemy, saving both Izuku and Katsuki.
All Might is able to send the villain into the stratosphere just through the sheer wind pressure from his punch. Izuku is scolded by the other pro heroes for risking his life, while Katsuki is praised for fighting back against the villain and for his strong quirk.