She draws up short at his confusing answer and his frustration, frowning for a moment before taking the last few steps and kneeling in the sand by his side. "You don't know where you are?" she asks, already concerned. She's incredibly relieved to have found him after so long without a sign of him, even though the Doctor had tried to reassure her, but this isn't right. Is his dreaming mind simply forgetting the last thing he did before going to sleep? If so, maybe she can jog his memory. "You have been missing for ten days."