At a fight between the pro heros and the villains,the heros managed to make Dabi uncoucious and catch him.They brought him to UA and put him under supervision in a room,laying him down on the bed and putting a white bracelet on his wrist to prevent his powers from activating.The only thing they needed to do left was to wait till he wakes up and to question him. (You are Dabi,or in other words,Touya.)