People keep postulating that Bran will warg into Drogon for various reasons - but I thought that Bran could only warg into simple-minded animals and humans. Isn't the dragon supposed to be an intelligent animal, thus unable to be warged?
Flashback to highgarden. A goat herder finds a burnt animal from his herd and the half eaten corpse of another. The dragon queen was in westeros. Mhysa, they had called her in slavers bay. It meant Mother. This was obviously the work of one of her "children".
He looks out at the dusty meadows. The low clouds cast a shadow half the way to kings landing. But one spot in the shadow seemed darker than the others.
The oldest dragon was on the hunt. He took cover, though he knew it wouldn't help. A dragon eats whatever it wants.
But the shadow was large, and misshapen. Something was in its claws. Bran steps out from the fields to see what it is.
It was large, and cumbersome, even for the giant beast. A piece fell off. Then bran realized that this was no piece. It was a horse. What could he possibly be carrying that a horse fell off?
It was one of the wagons. The lannisters had sacked the castle, and Danaerys was taking their wagon. The first wagons had gone to kings landing in a hurry with all of the stolen gold and spoils. Which meant this one had all of the food. Without it, everyone outside kings landing would be dead before winter was over.
Bran knew he was looking in the past. Or maybe the future. It was hard to tell. But he had to do something. He tried to warg into the dragon's head.
Its eyes widened, and he heard a voice in his head. You... are not my mother... you... do not... belong here.
It was too smart. He couldn't control it. And now it was turning towards him. Could it see him? Or touch him, as the night king had? The dragon's head reared back. It was going to breathe fire down on him. And that would destroy the wagon and sentence all of these people to death.
He didn't fear for himself.
Drop the wagon! Screamed bran into the eldest dragon's head. It resisted. He screamed again. Drop the wagon!
The wagon fell. So did the dragon. It collapsed to the ground, landing hard and shaking the earth. Its arms twitched as it convulsed. Its mouth opened, but not to roar.
Drop the wagon.... drop the wagon... drop wagon... drop wagon... dro gon.. dro gon...dro gon...
The end