Now I am almost certain this "demonic" look in the eyes of the mink is due to eyeshine and the trick of shadows & light but it certainly gives this little mustelid a different perspective.
On the general side, this little mink was making use of the logs as scratching posts, particularly around his neck area (believe this is a male from its size and head shape). Like the porcupine who I have been watching who is frequently scratching, I believe this is due to both mammals trying to "brush" out winter coats. I have, in fact, seen tufts of old fur left on the porcupine's claws from scratching.
I did manage to catch this little mink scampering along a log but his fur behind his head is looking a little sad so I hope to be able to photograph him again once his sleek summer coat has come in and replaced that old fur.