She ghosted her hand down his arm and threaded their fingers together. His skin was strangely cool, but, then again, so was hers. She didn't have a soul to warm it.

"You do what you believe is best for the universe," she soothed. She didn't croon as Drusilla would. She was cleverer and calmer. Majestic. Her comfort was a different kind of comfort. "That's all we can do."

How would the real Romana have reacted to a change in a fixed point? Drusilla didn't know because the Doctor couldn't be certain.

"I need more information, Doctor. About Taxon. About the fixed point."

Drusilla understood the concept of a fixed point, more or less. A knot in a string that couldn't be untied.