 An important corollary of Indirectness is that whether an assertion is all-things-considered permissible or not may depend on factors that are independent of N. When you say something offensive, or reveal a secret that you agreed to keep, you may follow N and yet make an (all-things-considered) impermissible assertion. And when you lie to save a life, you may violate N and make an assertion that is (all-things-considered) permissible.