Kat didn't like it - seeing Bill walk down the streets like that. Even wit them close. Not with a personified Evil prowling the streets. He was older than her now but that did not stop her from worrying. He was human. He was more fragile than she was and than most other members of her family were.
For a while she had chatted with her father but now she felt the urge to catch up with Bill. So when she spotted a moment when no one was watching them, she teleport Ed right next to him.