In Grimm, what is the real-world reason for the Wessen head shake during woge? Is it to mask the morphing software?
This occurs in all episodes: Wessen characters snap their heads from side to side during woge transformation. In some (most, actually) werewolf movies for example, you can see clumsy morphing from human to wolf forms. It's time consuming and costly to do in production.
Since it occurs in Grimm so often, I'm wondering if they have a simplified morphing software of which it is necessary to mask intermediate stages of the frames.
The in-universe explanation is that it is mildly painful. I'm thinking this is a justification for a post-production reason.