Well, Vince was right in this case. If E and Billy want to kick each other's ass in private, fine. But out in the public spotlight, E is the producer--the guy who's supposed to oversee the whole project and make it run smoothly. Billy is the director--the artist whom everyone kind of expects to be a little crazy. E's got the responsibility of keeping it together and putting on a stable public face, which doesn't work if he's going around starting fights with Billy. Billy, on the other hand, gets more leeway because he's the artist and everyone expects him to be a little crazy.