The Doctor watches her with interest as she spoke, and burst out laughing at the end, "Ah, but I am a touch mad!"

There's a quick tug to his earlobe as he paced, "This woman..." He pauses to run his tongue along the top of his teeth, "She helped me with something once, but I couldn't exactly help her in the end." He only managed to save her to a dataframe, but her physical presence is no more. "I owe it to her to meet her again." Mostly, he was curious to know who she was and what role did she play in his life. She obviously knew him, but he didn't know her. Not how she presented herself to him.

Giving her a side glance, "I'll do just about anything for my friends, Miss Nyghtngale." And silently, that includes you Clara.