Aizawa always thought there was something wrong with you. You were quite, not many friend, never went to school gatherings, and just kept to yourself. He didn't understand it, you had a strong quirk, yet you held back. He always made sure he paid a bit of extra attention to you. Maybe a few words of encouragement here or there or praise on good grades, nothing too serious. He would check on you at nights in your dorm room when you were alseep, just to make sure. He had a strange sense of protection for you.
That's why he was heartbroken to see you chained up in an interrogation room.
After joining the villains at the beginning fo the fight, you fought the heros and your classmates alongside the villains. It took a great amount of force to stop you and finally capture you, but they did it. The other heros just wanted to throw you in a jail where you couldn't do anymore damage, but Aizawa wouldn't allow it. He wanted to talk to you first. He needed to. He needed to know why you did it and find out if there was any hope of saving you. He wasn't ready to give up.
He quietly walked into the interrogation room and sat in the chair in front of you.