Going to jail isn't a happy occasion, unless you are Otis, the town drunk.
It sounds to me as though attack was a long time coming, since someone else posted that when she was arrested, she showed the police a large bruise on her thigh. She doesn't look very big, the husband could have easily over powered her, if he thought it necessary. My guess is that he hit her in private and in places where the bruises would not show. He was probably just waiting until they got in the car or home to hit her.