The lady by the river

There was a young guy running close to a river. He would cross the bridge and turn around just to cross the other bridge, just going around in circles. One night that he decided to go for a run, he saw a lady dress elegant just starring at the river. The young men just kept running around in circles, until he decided to talk to the lady. As soon as he say something the lady turn around he turn paled and run to his house. The lady had no skin in her face, just bone.