Having listened to the second riddle being spoken, the Slytherin paid attention, thinking it over. And...well, Isabelle made sense she supposed. Is a bell. Huh. Clever. OMG! He was giving people chocolate. He was giving people CHOCOLATE! She was almost too focused on the fact that Professor McFluffy was giving people the most evil food ever, she almost missed the third riddle. What? WHAT!?

Round and round...straight ahead...never complain...what, a five year old spinning in circles? That made sense too. Though obviously it was something round, and it went straight. A round thing...that went straight. Oh wait, the talk of a dog made her lose her train of thought. Good thing too. A portkey was probably not the right answer. Well...actually... "A...portkey?" she muttered, still thinking about it, and still...staring at the Professor. The holder of evil food.

Pfft.