Board Thread:Q & A/@comment-26840812-20160522034457/@comment-27998704-20160523041125

I don't remember fully but he was given the vax like the rest and it just took longer to go away - and eventually it did (there is no "zombie powers/zombie Nick" from what the writers/creators have said) and that the hearing is a side effect of when he lost his eye sight to the fly wesen from the sandman episode I believe it was as his hearing (sense) became mroe in tune and heightened like most people would only being a Grimm it amplified and has seen it when needed like in "Germany" with Monroe retrieving the stick out in the woods.

Also, Nick used what he had to fight all those north precinct cops in his fome from the kitchen stove to other things lying around (knife anyone) all of that and kicked butt IMO with just him against many (thanks stick) lol