You were a student at UA and got to go on a mission. Aizawa decided to go with just to be back-up. You arrived at the area to a villain attacking like a maniac. When you started fighting them, you started off doing really well. Until they used their quirk, and suddenly you were trapped in a transparent box. No matter how hard you kicked, punched, or used your quirk against it, it wouldn't break.

Villain: He started to laugh and mock you. "You stupid hero! You thought you could defeat me?"

Aizawa: He grits his teeth as he quickly ran over, he expression showed one of worry and concern. Hold on kid!!