You can understand people’s “Kung Fu” (translate it with system of belief, philosophy or culture if concerning businesses) observing how they do little things, how they treat people they don’t need, how they behave far away from the spotlights, perhaps with their family.
The comparison between the two "negotiators" represents the heart of the film, and gives a real "concentrate" of negotiation techniques (in emergency situations) that highlight the (intelligent and refined) comparison between two great actors who play two savvy and competent negotiators.
If we were forced to choose between one option or the other?
If we were forced to express our point of view, every day, knowing that what we are about to say might put us in a bad light, it could hurt the other person or ruin our relationship?