There's a bit of irony that Otis knew that she was in the barn. He would have told them as soon as he heard about her.
first of all, way to ruin it for anyone who hasnt seen the episode yet. i have, but im just sayin.
Dude, couldn't hold back any longer...that episode was heart-wrenching. Besides, once the final episode was aired...it was open season for spoiler alerts all over the web from Youtube.com to Entertainmentweekly.com...
One of many examples:
http://www.youtube.com/watch?v=DEqfVAEhvC8