Board Thread:Spoilers/@comment-25710160-20141120160632/@comment-25323232-20141202195644

I guess Lincoln will be injured and they (O, Bell etc) want to take him with them but because of something else happening at the Mountain, they can't and have to leave him behind. Of course Octavia insists on going back and Bellamy promises it but at the moment they can't do anything for him. So yeah that's my guess. Poor Lincoln and O ):