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From that the talk turned to the great hoard itself and to the things that Thorin and Balin remembered. They wondered if they were still lying there .unharmed in the hall below: the spears that were made for the armies of the great King Bladorthin (long since dead), each had a thrice-forged head and their shafts were inlaid with cunning gold, but they were never delivered or paid for; shields made for warriors long dead; the great golden cup of Thror, two-handed, hammered and carven with birds and flowers whose eyes and petals were of jewels; coats of mail gilded and silvered and impenetrable; the necklace of Girion, Lord of Dale, made of five hundred emeralds green as grass, which he gave for the arming of his eldest son in a coat of dwarf-linked rings the like of which had never been made before, for it was wrought of pure silver to the power and strength of triple steel. But fairest of all was the great white gem, which the dwarves had found beneath the roots of the Mountain, the Heart of the Mountain, the Arkenstone of Thrain.
"The Arkenstone! The Arkenstone!" murmured Thorin in the dark, half dreaming with his chin upon his knees. "It was like a globe with a thousand facets; it shone like silver in the firelight, like water in the sun, like snow under the stars, like rain upon the Moon!"
But the enchanted desire of the hoard had fallen from Bilbo. All through their talk he was only half listening to them. He sat nearest to the door with one ear cocked for any beginnings of a sound without, his other was alert or echoes beyond the murmurs of the dwarves, for any whisper of a movement from far below.
Darkness grew deeper and he grew ever more uneasy. "Shut the door!" he begged them. "I fear that dragon in my marrow. I like this silence far less than the uproar of last night. Shut the door before it is too late!"
Something in his voice gave the dwarves an uncomfortable feeling. Slowly Thorin shook off his dreams and getting up he kicked away the stone that wedged the door. Then they thrust upon it, and it closed with a snap and a clang. No trace of a keyhole was there left on the inside. They were shut in the Mountain!
And not a moment too soon. They had hardly gone any distance down the tunnel when a blow smote the side of the Mountain like the crash of battering-rams made of forest oaks and swung by giants. The rock boomed, the walls cracked and stones fell from the roof on their heads. What would have happened if the door had still been open I don't like to think. They fled further down the tunnel glad to be still alive, while behind them outside they heard the roar and rumble of Smaug's fury. He was breaking rocks to pieces, smashing wall and cliff with the lashings of his huge tail, till their little lofty camping ground, the scorched grass, the thrush's stone, the snail-covered walls, the narrow ledge, and all disappeared in a jumble of smithereens, and an avalanche of splintered stones fell over the cliff into the valley below.
Smaug had left his lair in silent stealth, quietly soared into the air, and then floated heavy and slow in the dark like a monstrous crow, down the wind towards the west of the Mountain, in the hopes of catching unawares something or somebody there, and of spying the outlet to the passage which the thief had used. This was the outburst of his wrath when he could find nobody and see nothing, even where he guessed the outlet must actually be.