Board Thread:Episode Discussion/@comment-14138255-20170129165318/@comment-30530552-20170130031238

SomeoneYouUsedToKnow wrote: Eh, no, we know it destroyed Kuroyuri, and it's implied it wrecked Shion too. I don't think the same was said for Oniyuri. They implied it for Oniyuri too. If you go back through the transcript when they describe what happened to it, he said "What always happens," and uncovered a set of claw marks. And when they say "The Grimm" in the plural, he says "Not just any one," in the singular, where Ruby confirms it by asking "One?"

To me, that heavily implies that he knows how it got destroyed, and considering how scared of that thing he is, and the association it has with hi parents...its not too hard to connect any dots and jump to that conclusion. I could be wrong, but I think the Nuckelavee was there too.