The dialogue in this movie is remarkable. A special language was drawn up. They communicated by grunts, guttural sounds and gestures. Even lacking translation, it was not difficult to pick up the gist of their communication. Their conversation after discovering they were with out fire, resembles a modern group facing crises. Here is where communication breaks down, just as it does when a present day group is under threat of losing a vital possession. Emotions tend to rule, and logic and planned response take a back seat. Here we witness the squabbling and in fighting that results as they try to figure out a method to obtain more fire resources.
Finally a band of three is sent out seeking fire. There are hints this is not going to be an easy trek. For one thing, which direction would you go to look for fire. It is not quite as simple as trying to find berries, when you just head to the regular patch that is always in the same place. Fire seems more elusive. It will not likely be found in the same place. We follow this crew as they wander around searching for fruit of a different nature. They interact in much the same way as a modern group would react to a loss of somethiof prime import but with not much clue of how to restore it. Finally off in the distance they notice smoke-- a sign of their elusive goal. They head gingerly in that direction, not knowing who they may encounter. They find that the smoke comes from a campfire of a group of cannibals preparing to have a feast.
The intended dinner, is tied up nearby. One of the dinner party already is missing an arm and it is shown being turned on the fire. Fumbling with their language, the band of searchers concoct a plan to steal fire and in the process, free the human cattle. As fate has it, one of the freed bunch demonstrates how to use flint to make fire. Besides this their teacher, a female, shows them new techniques of human fire making. Up till then our band enjoyed animal type sex, but now they were shown lovemaking. They proceed back to their tribe with much booty. This small aside, may or may not have been realistic, but I enjoyed it showed how in many ways sparks can turn to flame. The acting was elemental, but good in that all that transpired happened without a word off English, yet I felt I had good grasp of the story. Well done.