Board Thread:General Grimm Discussion/@comment-3125844-20150306162148/@comment-26198454-20150319174418

The core of the zombie mythologems is the idea that dead physically can not only return as ghost but also in the world of living as "undead". For something wronged, disturbing her peace of death, or their soul could not be saved because her way of life. This Cracher- Mortel reminds me at the stories about Voodoo black magic priest(bocor) or priestess( mambo) with a curse. Then the dead is awaken ritually back to life, to be abused as slave.But this time it was also a Grimm. As Rosellee said, they react in another way. (So my theory is)  Nick has been on the other side and returns as a kind of "Zombie-Grimm" in the world of the living. Maybe he is able to travel between the dead and the living world. That could explain (in further episodes) why he cannot feel something, the strength or even die. Don't get me wrong, that doesn't mean he is Immortal but hard to kill. Sure, if you cut of his head, it's over. But it could  explain this side-effect turning gray.