[He knows full well how capable she is, but that doesn't lessen his concern, or his worry. Hell, he's just as worried about Ianto too, and he knows exactly how well the Welshman can handle himself. This isn't a matter of Rose not being able to handle herself, it's a matter of exactly how dangerous the Master is. Jack inhales deeply, shakes his head.]

I can count the number of people I trust to handle the Master on one hand, and there's only one of them here. [And between he and the eldest Doctor, the only one who will recognize the Master, he's the only one willing to use lethal force. As for the 'gods...']

All I ask Rose, is that you watch yourself. ['Because I couldn't handle seeing you in his hands.']