User blog comment:Zathronas/Analysis by an author: Volume 2 episode 9: Search and Destroy/@comment-10390252-20141003134556/@comment-10390252-20141003140514

Everything I post is based on what is in the show. If you read my post, you'll see that I said that the Grimm are the product of dark aura, not that they have any aura in themselves.