Non-beings.

Sohrin paused for a moment, certain that he had read about this topic before, but despite his lack of recall, he raised his hand in the air to respond.

"They are magical creatures like dementors and...and ghouls? Boggarts, not ghouls, I think" Uhm....there weren't any of those behind that door, right? "Oh! And they feed on human emotio---" Sohrin suddenly GASPED as he realized what the professor was up to. He looked from the door to the professor and then back to the door, taking a step back as the scratching became louder. He was certain that they were keeping their emotions in check!

Oh, he was SO SMART! He, too, will be emotionless from now on! He took a deep breath and relaxed, but instead of appearing cold, the Ravenclaw's act resembled more that of a brain-dead zombie. Minus the grunting.

As for his answer that he hadn't finished? He had completely forgotten about that.