In the next next scene, Professor Dadbeard is working on his Inu Yasha fanfiction, when he hears Beautiful Etheral Singing outside that the audience knows is incredibly spooky.
He wanders around the garden a little bit looking for a shard, then wanders out in the woods outside the castle, passing the ominous little free library pole shrine as the moon shines above, also ominously. Also, ominous music plays. Uh oh.