Leaving the room before the two, I made sure that whoever's following me would not try to check that room.
After walking past my suspect, I intentionally stopped for a moment, went back to check and acted as though I locked the room from the outside.
Following that, I walked all around the school while wearing the armband of the Disciplinary Officer. Let's just say, I acted like a patrol officer, ready to call out students with violations from the school regulations.
I also observed every student I passed by. Some looked on cautiously but most of the girls would still look at me in admiration.
Nonetheless, I kept a serious face which effectively warded them away from trying to interact with me.
Doing that for at most two laps around the school, although not as fruitful as I hoped it would be, it made me become aware that those guys from the delinquent group were all throwing me unkind looks.