She pauses, looking at him for a long moment before a telling smirk spreads over her lips. It's a smile that as close to River Song as he'll ever get. "Alright," she says slowly, clearly liking how he talked. He might be crazy, but he's not an idiot.

However, she's also crazy, because she's going to keep this guy, and she's just going to pray and hope that whatever information he has on the Weeping Angels and the Costello family is worth spending time with a nut job.

She points at him, waving her finger just slightly. "You'd better not be wasting my time, Doctor."