After Randy had his outburst that interrupted the class, he dropped the pieces of the note on the floor, once again "destroying" it.
But then Trevor reached down for the pieces. After watching what happened to Randy's lips, he was convinced that the note was magic after all. He wanted a closer look at it. Maybe later he could show it to Athena or Nadine. Perhaps they could figure out what it was exactly. He had never heard of a note that could cause these sorts of things to happen.