I took a bear safety course years ago, I used to haul seedlings for reforestation and take them out to tree planters camped out in the bush and it was part of the orientation through Canfor. in the course we were taught that there were different actions taken when attacked by a black bear or a grizzly, when a black bear attacks a human it is most likely starving and to fight as hard as you can. it will not attack long knowing it is expending too much energy for a meal and give up. a grizzly will most likely attack to defend it's territory or cubs, and will only attack long enough to ensure you are not a threat so playing dead (while protecting your neck) was the best course of action. black bears are less likely to attack when they are with cubs because the cubs are taught to tree themselves and only come back down when the sow calls to them. now this was some 20 years ago, I don't know if this is still current teaching or not...but it always stuck with me.