While he waited for the Master to respond the Doctor felt a horrible knot of anxiety develop in his stomach. As much as the Master was the last voice he'd wanted to hear, he felt so lost and alone that even the sound of a sworn enemy acted as some comfort to him. When the words came back to him, however, they were as far from comforting as possible.
The Doctor wasn't aware that Martha was in town, and as much as he didn't want to give the Master any ammunition, the word had slipped through practically against his will. Rose...