Having hunted most of my life I have spent a lot of time in the forests and woods. Bears do not see humans as a food source. A threat source, yes! We could literally get within sight and observe bears foraging for food and when they detected us, they boogied. They did not go "Hmmm,I think I will eat those hunters for dinner instead of these berries." Once an animal get the taste of flesh whether it be human or other, they then get patterned for it. This how cubs become saavy for salmon. They are taught by their mothers and then they are patterned for it. Another example is when I lived in Florida. I raised dogs (Rotties). One day our goat got its head stuck through a wire fence and could not retreat. Two 10 month old pups attacked the goat due to its braying I guess. Since that time these two dogs would try to get at the goats no matter what. None of the other dogs had this problem except these two who had tasted the goats blood. Since then the goats became fair game. Animals get patterned by blood.