Laurence [Fishburne] is a great example of how to communicate to the audience as you're acting with another actor.
We were all inspired by him as an actor and his iconography and thought, if we get somebody like Laurence Fishburne, we can tell a much more sophisticated, complicated version of Jack Crawford than we'd seen before as this large and in-charge and in-control guy, who is unflappable.
If you model yourself after Lawrence Fishburne, you can never go wrong.