After some genious moves by barbs I have this impression lately that barbs play as a team. As in each barb has line of sight of every other barb on the planet. I had a scout (waiting to enlave some civilians) sitting next to Persian borders, who just spotted a barb, which looked ready to capture/pillage some Persian spoils. I moved one of my archers towards the encampment the said barb originated from. Now, instead of taking some Persian civilians/pillaging land that barb moved 6 tiles back to the camp he was born in, just to save his buddy from my archer, who was about to destroy him. Coincidence? Or do they act as a team with line of sight and everything?