This fits in with an old Siberian legend about a headless wolf that still devours lone travelers.
It's a weird legend because, y'know, no teeth.
When I was in college I was watching movies one night with my girlfriend and her dad. We were watching "American Werewolf in London." Two American hikers in England are attacked by a werewolf. One (Jack) is killed and the other (David) wounded, becoming himself, a werewolf. The mutilated corpse of Jack haunts David in an ever-decomposing state warning David of what he is to become during the next full moon. In one scene, Jack, flesh rotting off his skull, calls David a "schmuck."
MY GF's dad thought it was hilarious, that he was able to say, "schmuck"...without any lips :-)