People use the futures as a leading indicator to trade stocks. But some stocks seem to lead the futures. They bottom and reverse before the futures turn up and the reverse applies on tops. This is not always true as sometimes they lag the turning points and this divergence is easy to trade. It seems traders position themselves before hand to capture the next reversal and ride the rally in the futures. This seems to happen at various times throughout the day and for various duration. But clearly the stock has some capitulation volume at these points and reverses before the futures. My question is how do these stock traders/ market makers know that a turn in the futures is arriving well beforehand ?