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."
Tom StoppardI would join Sisyphus in Hades and gladly push my boulder up the slope if only, each time it rolled back down, I were given a line of Aeschylus.
Tom Stoppard