Johnson should not have slapped her.  He had not hit her hard, not even as hard as he used to hit his wife before she went home to her parents, and not nearly as hard as he had often hit prisoners who were reluctant to talk.  Up to this time Smith had shown no expression at all and had said nothing; he had simply let himself be forced into the room with the passive, futile resistance of a puppy who does not want to be walked on a leash.  But he had understood nothing of what was happening and had tried to do nothing at all.