Flint knapping does something to people. Everyone I know who has learned this skill (to understand prehistoric humans) becomes oddly obsessed with it. They do it waaay more than is strictly needed to understand the archeology. And they become ... evangelical about the whole thing. "You have to try this!" knappers can be very pushy.
I have no doubt they are correct, it must be a kind of time travel through synchronicity.
But, I also wonder if they have awoken something in themselves.