It explains a lot. Why Morgana was the only one utterly unconscious at the site, why her injuries were so extensive. The Master didn't like sharing, and while he could probably handle sharing Rose romantically, he wouldn't share the psychic connection he once had with the Doctor. Morgana suffered for the Doctor's curiosity.

His hand on her shoulder, he takes a breath. For the first time, lying doesn't even feel like an option.

"Sort of," he says. "It's not that simple."