"If we don't die in a cave, teach me that for later." He watches attentively enough that he has some idea, but guided practice never hurts.

He loops the end of their new line around his wrist a couple of times, leaving more than enough slack for her to do the same, and tucks the last bit into his hand. "We'll walk as far as we can with this light and use the candle," he says, starting in through the crack. He has to hold his pack in his other hand and slide through sidelong, but after a couple of yards there's more than enough room to shoulder it and walk.

"The notes say Margaery found some kind of wooden door in the wall, but it might still be standing open."