We'd be working in our motel room through the night, and I'd come up with an idea at two in the morning, and he'd start jumping up and down, pacing across the room, or whatever. ↗
I find it enormously valuable to be sure that that the pacing is what I think it is and that the scenes have the shape I think they have musically and dramatically. ↗
The storyboard artists job is to plan out shot for shot the whole show, write all the dialog, and decide the mood, action, jokes, pacing, etc of every scene. ↗