The class was out for training, mimicking of how it would be fighting on duty as heroes before getting caught in a villain attack. The buildings around got so demolished, that when the villains disappeared the piles were falling and falling.

When you looked back to check if your close friend is okay, you saw that a large pile was aiming to fall directly at your friend if she didn't move. Your legs started to move on your own as you ran towards her, wanting to get there first and push her out of the way. Despite knowing you were too far to save her. Something would most likely crush you too.

While running, someone wrapped their arms around you, jerking you back. You knew who it was, but didn't care. You were too busy yelling out for your friend, and struggling to get out of Aizawa's tight grip. It was only when you screamed her name that you saw her head and body getting crushed by the piles falling on her.

Aizawa behind you had a solemn look on his face, this situation was the exact same that happened to him with his best friend. Which to this day haunted him. But he did this because despite knowing she would die, he didn't want two of his student die. Not on his watch.