I'm going North with Viy following me for a turn or two. Next turn Viy disappears on cloth map. Happened to see crossed swords indicating someone was there.
Debug.err http://pastebin.com/AVRWcS41
Screen print
http://picasaweb.google.com/116536541684555926479/ScreenShots?authkey=Gv1sRgCMupyZfM-4vngwE#5464656251102218322