Boise, Idaho man said attack happened too fast to use either when he surprised the bears-
Fortunately he was able to walk 4 miles to the trailhead.
Update: the original story has been replaced by a much more detailed one below.
Boise man in hospital following griz attack. By Karin Ronnow. Bozeman Chronicle Staff Writer
. . . and there have been more recent encounters.
Two Alberta men recovering from grizzly attack. Edmunton Journal. They were searching for elk antlers. A lot of grizzly bear attacks have happened to those looking too intently for elk antlers while in grizzly country.
Glacier National Park jogger survives grizzly attack. Missoulian. By Jim Mann in the Daily InterLake. The jogger forgot his pepper spray. At any rate, jogging on trails in dense grizzly country like Glacier National Park is not a good idea.