Caitlyn calmed down just a bit hearing that it could be just something normal as not getting enough sleep. "What is it with immortals not getting enough sleep? Honestly, you two could worry a girl to death." She joked to get herself calm for she didn't like seeing Jack like this. It was wrong on so many levels.
Rose lays a hand on Cat's shoulder with a small smile that said that it was going to be fine. After all, she trusted the Doctor full heartedly. If he said that Jack would be fine, Jack would be. "Seriously though, tag?"
"I get my childish urges. They're fun when you follow through them for no good reason." Cat said with a shrug putting her worry aside for the moment. "So you two, I am going to get some more reading material and make sure Jack gets better. Find someplace where we have to do some running eh?" She said with a smile leaving to get her research books, the TARDIS making it a shorter trip. "Thanks girl." She said grateful.