Action must be very difficult to write well.

So much of it is simply imaginary before getting to the set, I would think. Important beats in the action are planned, I'm sure, but so much of the little stuff, much of which is potentially very cool, seems like it needs to be created somewhat spontaneously. Maybe I just have a difficult time conceptualizing it because I practice it so little... maybe it's not that hard once you've done it a lot. Anyway... I have a lot of respect for those that are actually good at it. It makes life that much more exciting from time to time.