To me, it's kind of like, "know thy enemy." If you've worked with them, you know their dirty tricks. If they know they're going to be up against you, they may b

To me, it's kind of like, "know thy enemy." If you've worked with them, you know their dirty tricks. If they know they're going to be up against you, they may be less inclined to use them because they know that you know what they're up to.