"It's good that you're together. I feel lost a lot of the time without Simon. He looks after me, keeps me grounded." Which even River would admit was something she needed. There were times, though, when she preferred Book or Mal's way of keeping her grounded than Simon's, which was usually overly fussy.
Still, Castle's story made her feel at ease about something else. "You didn't disappear. She thought you were still there the whole time?"