Soon shall thy arm, unconquer'd steam! afar Drag the slow barge, or drive the rapid car; Or on wide-waving wings expanded bear The flying chariot through the field of air.
Rewriting isn't just about dialogue, it's the order of the scenes, how you finish a scene, how you get into a scene. All these final decisions are best made when you're there, watching. It's really enjoyable, but you've got to be there at the director's invitation. You can't just barge in and say, "I'm the writer. "