Jack's heart ached for the Doctor. He could see the visible pain he was in with just the thought of losing the only other member of his race. Not something Jack felt he would ever really have to deal with; after all, he'd seen his people survive the end of time. But still, in all of the whole wide universe, were these two really the last ones?

He looked down to the Master, knowing full well what he was capable of. The Doctor had to know too, right? There wasn't any way he couldn't. Not after all this time. Still, he was too clever... too dangerous to be left alone. Without even thinking, Jack spoke up.

"I don't want to go home. Not yet. Not while you've got this lunatic on board with you... I can't leave you two together in good conscience. It wouldn't be right. What if he hurts you again? I'd never live with myself."