[ Their friends do have a tendency to go off half-cocked but it's not just about that; it's watching them to make sure they are safe and he nods. April's death was terrible to hear about but for all they know whatever did that could be an innocent party... ]

Just the... No. Possibly large, possibly fast. For it to go unseen in the castle and for what it did, speed has to be an ability. An animal, some type of beast perhaps. It can't have much in the way of thought going by what it did.