River had this dreadful feeling in her gut that there was a very important reason the Master didn't just up and kill her when he'd knocked her unconscious. Surely he wouldn't try to pry her secrets from her? He was Time Lord, he had to know she kept them for a reason. So that time couldn't be rewritten and the Doctor's history with her could play out as it was supposed to. Foreknowledge of the future was dangerous in any circumstance.

Still, she wouldn't let him see that he'd gotten to her. Not at all. This hybrid Time Lady remained poised and nonchalant. Almost as if she were getting her hair and nails done instead of about to have her mind invaded. "My lips are sealed, sweetie. Torture me all you like."