Shinso didn't understand why everyone at UA was convinced that he and Eraserhead were related. "Are you Aizawa-sensei's illegitimate love child?" He didn't know if this guy was serious, or if he was just trying to fuck with him. He didn't stay long enough to find out. OR Shinso tries his best to stop himself from seeing Eraserhead as his father, while Aizawa realizes that perhaps it wasn't so bad being a dad.