Ron was silent for a few moments as they walked on, thinking. How had it opened? Dragging Harry up out of the lake was a blur. He'd been fighting to take the locket off, and then ...
"He said something to it." Ron remembered his mouth moving; everything else was lost in the very unpleasant haze that had followed. "I don't know what. Ask him when he's come round, I guess." He was short of breath by the time they reached the tent, still soaked and shivering like mad. "I brought food," he said as he started towards Harry's bed.