The skeleton enters the woods and there are two boys camping nearby. It walks up to them, grabs the smaller of the two and sucks out his soul leaving him an empty husk.
Then once the skeleton is done, his bones grow thicker and longer and his fingers become sharp as his canines become short fangs.
He then runs down the second boy who had tried to escape and sucks out his soul. The skeleton doesnot grow bigger this time but claws form from the tips of his fingers and his toes as his fangs grow even longer. A protective covering grows over his shoulders and his ribs and his feet take on a digitigrade stature. He then continues on his way.