The Doctor leaned towards her, concerned. "How---no, River. Stop. This...we can't continue with this much mystery between us. Like a bit of mystery, me, but we can't wander through with this much. It's---"

Another set of lights went out down the hallway, and there was the sound of something crashing in the distance. The Doctor looked over towards the darkness and reached out for River's hand.

"Maybe we should---?"