User blog comment:Abelskie/The Grimm-ness of Nick/@comment-1966944-20120215075932/@comment-27.108.1.43-20120215111837

I subscribe to the same theory as you, with certain creatures able to hold their own guises even in the presence of a Grimm; that there are creatures that are not necessarily fearful of a Grimm so much as antagonistic and cautious towards them. This would explain why the cowardly eisbiber lost his control early on and how the geiger were able to keep from revealing themselves to Nick. Again, these are speculations. If Nick knew that certain creatures can 'out-Grimm' him, maybe he too would be cautious and try to seek if there are ways he can 'out-out-Grimm' them back (I have been coining my own words quite liberally, haven't I?). The writers can use that to develop Nick's character as a Grimm and at the same time use that as an expositionary tool to explain the mythos.