Just an idea that came to me after reading Blood and Fog, inspired by a line in there. What would happen if a Watcher had an unsatisfactory Slayer? Or, in my story, he came to tell her she was the Slayer and she said, 'no'?
http://www.fanfiction.net/read.php?storyid=1349893
http://www.fanfiction.net/read.php?storyid=1349893