He followed Jack into his office after he took off his coat first. He noticed JAck had pulled out Arwens sonic screwdriver. His eyes widened. He knew that sonic screwdriver was like the one his sister once had, No it couldn't be. He hadn't been sure about believing the voice on his phone. He had thought his sister had died.
"My sister had one like that......," The Doctor said softly.He looked at the sonic screwdriver, He had tears in his eyes "I was sure she was gone... But that man...... on the phone said she was alive," He looked at Jack. He sits by Jack and he was thinking. How could she be life. "I wonder what happened to her," he was tapping his fingers. He looked to be in deep thought. "Though... that man, I think is the Master. I didn't remember the Master until just before the call was ended. He knew that Jack knew who the Master was. He wondered what they were going to do, he was still examining the screwdriver.
"She doesn't remember thats clear. Maybe her memories are in a fob watch, Though I wonder where that fob watch is." He looked at JAck to see what he was going to say. He felt rather worried, if the Master wanted his sister that wouldn't be good.