JACK Do you have the slightest idea what a moral and ethical principal is? Do you?

Jack's discourse is now no longer about shared information, earlier at least his lies have meaning as shared data (in pure contrast), now solely he controls the definitions of the words he's speaking -  asserting God-like control. The language no longer has any shared meaning, the role of the alphabet has merged with the role of the container the hotel provides. It is false facing. Jack is psyching himself up to kill her by exploiting spoken language.