My hero academia season 1 episode 2

Near Tatooin Station, Katsuki's friends comment that he may have gone too far bullying Izuku this time in reference of Katsuki telling Izuku to take a leap off of the school's roof, to which he replies is Deku's fault, and he needs to learn how the world works. While they're talking, Katsuki is attacked by the same sludge villain that had attacked Izuku. Izuku asks the number one hero if someone who doesn't have a Quirk could also be a hero like him. As Izuku explains his ambitions, All Might reaches his limit and transforms into a lanky human. Izuku is shocked to see his true form, and All Might explains his transformation by showing the boy a wound he'd gotten five years prior, and gives the boy a lecture on the responsibilities of a pro hero: a pro must always be ready to risk his or her life, and so he cannot tell Izuku he can do it even while being Quirkless. As he takes the stairs down the rooftop, he notices that the villain he had captured is missing, and that there are explosions in another area of the city.