"Mm. A warning..." He moved back a bit, to lean against one of the railings. "I suppose it can't simply be brushed off as Carmen's psychic wires becoming crossed, so to speak. I wonder why her, though? I wouldn't imagine psychics would be a particularly rare thing for you to discover."

After all, if he danced around the topic of what exactly it was a warning of for long enough, it might be easier to steer the conversation in that direction without the Doctor clamming up. (Who else had warned him? It couldn't have been while Donna was traveling with him or the entire world would know by now, the same with Haruhi. Did that mean it was recent? Did that mean it was coming soon?)