Board Thread:Episode Discussions/@comment-3125844-20131122222527/@comment-5189167-20131216234328

I think that Nick is desensitizing and becoming callous about killing Wesen. To quote Sean Renard:

"Let me ask you something, Nick. What's really bothering you? That fact that you killed somebody or the fact that you killed somebody who wasn't Wesen?"

Great line there. All in all, Nick is losing the part of him that separated him from other Grimms, and I think that's what the big focus of Season Three will be.