River chuckles quietly to herself as she watches him fidget, blush, and turn to look away from her. Typical Doctor. He's not used to the idea of someone flirting with him. Someone knowing him almost better then he knows himself. She'd revealed that she wasn't entirely human, which surely accounted for her fast reflexes and any other abnormalities he might have noticed.

"Yes, I know what glowing, blinking, dangerous explosives look like, sweetie. I've encountered enough of them." Her travels had been long and extremely dangerous, so it was likely she'd traveled with him at some point in his future time stream. Still, she knows him a bit too intimately. Better then even Amy Pond professed to know him.

"You? Doing archaeology? This I have to see." She taunts him with playful laughter. "You were always teasing me about my profession." But how else was she supposed to find him?