Tom's behavior with Katie is a perfect example of the "handling" I was trying to describe in this post-
http://www.websleuths.com/forums/showpost.php?p=1527971&postcount=103.
It's the oddest thing to watch because it happens every time ya see these people (Scientologists)!
How it is decided who will be the "handler" depends on how the TR's (training routines) go (If they join together) or whoever has been in the longest. My brothers wife was the "handler" in their relationship, which means she was able to remain unresponsive and maintain the "thousand mile stare" no matter what was said or done during the "bullbaiting".... which can get pretty nasty!
This thing with Katie (major weight loss, her loss of identity, etc) is indirectly related to Tom because he introduced her to Scientology but it is Scientology that has created this new Katie, I'd bet money on it!! I have seen it happen before and it happens almost the same to each person successfully brainwashed by this cult!