"It's a fine line to tread." Between thinking like a serial killer and thinking too much like a serial killer. There have been times where they've scared themselves, but that's all part of the job. If you can't take it, you won't last.
"An UnSub who is constantly on the move may be harder to catch, but it's still valuable information when setting up a profile. The more data we have, the more of a chance do we have of predicting where they'll turn up next — of course, we've never had to deal with... dimension hopping, but if you're knowledgeable in that field it should still be applicable."