He wouldn't be expecting her to return on her own. Throwing him off-balance could be useful. She really didn't have the energy to fight her husband. Not only was she still not at complete strength from the bizarre illness she experienced in London, but it had also been months since she had cause to use magic for any extended period of time. Basically, she was rusty. She wouldn't stand a chance against a man who honed his skills on a daily basis with discipline and regular practice.