User blog comment:Hidden Scorpius XI/RWBY Manga. Chapter 3/@comment-3257939-20160204153014

I think the chapter came with great timing. We just learned that Grimm can be created via Black Goo which comes from a dragon. Grimm are artificially created by other Grimm.

Now ask yourself this: What would happen if a person without Aura touched that Black Goo?