That's four attacks. How many fatal falls during this period? How many drowning? How many fatal bee attacks? Attacks by dogs? Automobile accidents while en route to the outdoors?

I haven't seen any mention of Steve Herrero's work on bear attacks, either in the cited article or in the subsequent discussion. I believe he concluded that bear spray was pretty effective. One take away from his book that impressed me was the need to keep a clean camp; that seemed to trigger many incidents.