The Doctor knew what Jack meant. "Not quite to the extent of some," he said. "The Master was also very different from the rest of the Time Lords. More inventive, rebellious. Ambitious. Time Lords were content to just be in control of everything. The Master wanted to own it."

He prodded the insects out of a small cave and pulled the key from his pocket to set as a shield around the area. "Seems they didn't recognize a Type 40 key, either," he said. "For the best."

He clung to the spear as he went about clearing out the cave and making room amongst the rocks for them to hide. On any other world, he wouldn't have thought about holding a weapon. Here, on Gallifrey, it was his responsibility.