The Doctor leaned onto him and sobbed a bit. He closed his eyes for a moment "If it is the Master, you know I would still never kill him. But I would still keep Arwen safe, But we will have to keep her safe and not tell anybody."
He didn't want the Master finding them easier. "Could do, but anywhere else other than here could be too risky for us. Can anybody here do DNA tests." He knew he maybe could in the TARDIS if not, it would just be easier if he had somebody to help.
He was worried for her safety. "I was hoping the Master wasn't a problem anymore." He knew he got stressed trying to deal with him.