>>118771665We can see that Mira was chained with iron chains and a finely carved wood collar.
Her captors on the other hand, were Australopithecus that used crude spears for weapons.
I suspect that the restrains were stolen technology. Even the boat seemed to advanced for the Australopithecus.
My running theory at the moment about the future...
I suspect that there is an iron age civilization, that has been overrun by primitive Australopithecus somehow. It's an enigma why the iron age culture couldn't repel them with their iron age army. Generally tech advancements like metallurgy are associated with weapons, but whatever, they're peaceful and helpless apparently. Spear will have to find them, and provide a training montage so that they can learn to fight off their oppressors. Mira will thank him for his service, and offer him some kind of chance to stay in the city. Spear won't go for this, and instead wanders off to do caveman stuff.