In the next scene, we see that Professor Dadbeard is back in his fanfiction library, when a servant disturbs him and we see that he is stoned! As in, his skin is all gray now and he is gradually turning to stone; he warns the servant away.
Releasing that he is doomed to be a clue in a monster mystery, he starts writing a letter to Doctor Muttonchops explaining that a monster is turning people into stone and only Doctor Muttonchops can resolve this because he is a Science Master.