The Hobbit: What Unlikely Ally Protects The Dwarves When They Are Trapped In The Lonely Mountain?

gamerant.com:

Through all of the struggles and challenges that the companions have faced on the quest to reclaim Erebor, from nearly being cut down by goblins in their dark tunnels underground to narrowly escaping becoming lunch for the giant spiders of Mirkwood, the group never knew if they would make it to the Lonely Mountain or not. So when they get there in one piece, none of them has given any thought about how they get themselves in, or get the sleeping dragon out.

After much difficulty involving the last light of the moon, and an ancient key that has been passed down from the forefathers of Thorin, they manage to get in and to wake the terrifying Smaug. In a rage, he flies out of the mountain, setting fire to the lands all around it, and then crashes into the stone in the side of the mountain in order to cause a rock slide. The dwarves are luckily inside the tunnel at the time, but they find that their way is completely barred, and that they cannot escape via the door they came through, and must instead journey deeper into the heart of the mountain to find another exit. The only problem is, they have no idea when Smaug will return, and they are afraid to go off exploring in tunnels in the dark under the knowledge that a fire-breathing dragon might come along at any second and smite them.

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Subsequently, they find themselves trapped within the very halls that they were hoping to reclaim. Luckily for them, Smaug has his sights set on vengeance with the people of Lake Town, and has disappeared off to wreak havoc for the village on the water. The Master of Lake Town has fled with all of the money, his servant Alfrid is no better, screaming “every man for himself” and actively pushing people