They embody hatred, anger, and fear. They often attack on sight, regardless of whether or not they are provoked.

[ ozpin has yet to see any grimm here, which is a good thing. he's tired, dammit. ]

And I'm afraid I cannot give you one -- not as of yet.

[ for one, he doesn't know patchouli, and doesn't want to give her access to how his students and himself fight. for another, ozpin hasn't properly explored this world, and hasn't found any to harness. ]