Jack needed no cue to know there was a problem. Merely seeing the look in the Doctor's eyes was enough to alert him, and quickly Jack was moving closer to the Doctor's side.

He shifted up onto his knees and moved in front of the Doctor. He braced his hand on the Doctor's shoulder and stared into his eyes.

"You're okay, Doctor. You're okay, I'm here and I'm not going to let anything happen, okay? Whatever this thing is doing to you I won't let it finish." He took the psychic paper again and opened it up, "Come on," he urged him along, "think it to me. Tell me what's happening. Tell me what you need."

His hand shifted from his shoulder to his cheek, holding gently, his thumb stroking.