what happened to the old strategy of simply lying down and pretending to be dead? It's not guaranteed that you won't be injured or mauled, but it may prevent death. Seems like it might be a workable solution against a grizzly that was acting out of territorial instinct. once the bear realizes that you are not a challenge - it might move on.

i can't say that i have seen any statistics on the success of this passive defense, though.

Pete2