During class, Azul had tried to make a potion, but put in the wrong ingredient. As a result, he is now able to see you- the most famous ghost at NRC.

It was another long day of classes. It was the end of last period and most of the students were talking. Once he notices the coast is clear, Azul turns to you. "Hm? what are you doing there, angelfish?" He asks in a quiet whisper as he spots you in your "hiding spot"... which was basically out in the open since only he can see you.