"Yes, I... I do think the Doctor would be a better idea than John," Lucy said, feeling strange and vaguely uncomfortable talking about John to Harry, especially with Corwen sitting there looking so worried about her and calling her 'sweetheart' until she just wanted to go to her and... be held. At any other time, she'd probably go to her, but she couldn't help feeling that introducing the idea of her and Corwen together to HArry right now would be just a bit too much for the poor thing to handle.
Harry gulped a bit, and nodded. "What did he help you with, Lucy?" he asked, trying to understand. He hadn't noticed the vibe between the women. He had too much else on his mind.
Lucy hesitated, and then explained - a somewhat PG version of what the Master had done, but with plenty of emphasis on the Doctor helping her get the Master out of her head again.
Harry listened, and nodded. Eventually, he said, slowly, "This... drumming noise. It really is a Time Lord thing, then?"