I had only seen the long view of this one before, not the FPV, so I'm surprised to learn that the running in circles thing actually did help - the drone had to get around to the other side of the vehicle to get a clear shot at them. Must have been terrifying on a primal level - humans facing actual nonhuman predators whose goal is to kill them and before which they are completely helpless. Been a long time since there were predators like that in the wild. The only way they might have survived is to have split up and sacrificed one for the other.