@farmerman,
Actually, quite a bit of grizzly bear behavior is predictable, FM. For obvious reasons, it's not something one would want to bet the farm on.
It's not unusual for the male of many species to off the kids to enhance their own chances of reproducing.
There's nothing shy and submissive about a sow bear that is raking one's cranium, sides and back with her teeth and claws. And she could pop open any brain bucket like it was a water balloon yet she most often does not. One swipe could end a life but it most often does not.
It seems exceedingly odd to me that a hyperphagic grizzly would content itself with mauling a hiker especially when it knows, and it does, that this squirming hunk is chuck full of protein.
Killer whales and other whales the same. They have had ample opportunity to off any number of researchers, divers, etc.
From my understanding hyperphagia does not extend to just before den up. Bears go into a transition period where they don't eat, but they drink copious amounts of water to rid their bodies of whatever they need to rid to rid their bodies of and tend to sleep long long hours before they actually hibernate.