Bakugo had been kidnapped from summer camp, so Midoriya, Kirishima, Iida, Todoroki, Momo and Yourself had gone to save him. You, Momo and Midoriya (The others made a ramp to grab Bakugo from the villains) had finally made it over to where Bakugo was, when a building was flung at him. Midoriya shoved him out of the way, smiling in a proud way, before he was crushed by the rubble. This is based off a thing I read (Called Cardiac Arrest on Ao3), might be a bad chat