Look in the archives of the HI forum -- Uncle Bill told the story of the farmer in Nepal who got charged by a bear and split its head open with a khukuri just as it got to him, and it fell dead at his feet.
Barring that, usually only a lot of luck will get you out of an actual grizzly bear attack, not a knife. Awareness and prevention are key -- charges usually happen to people who aren't careful and suprise a bear.
Black bears might be more squeamish than a griz, and easier to fend off, but there are no guarantees with bear behavior. You'll probably just really pi** off a bear if you cut it -- a wounded animal will likely become even more aggressive in its defense.
The old guy in Alaska was downright lucky. Don't know if there's much he could've done to prevent that one.
Polar bears are more dangerous than any other: food is hard to come by in the Arctic, and polar bears regard man as another food item on the menu. Ask the polar bear if she's a knife knut, and if so, hopfully you happen to own (and have on you) her favorite model -- so offer it to him...hee hee... well, she'll probably just take your knife and then eat you anyway...
If you really gotta get a bear off of you, go for its eyes with the point of the blade -- you might at least fare better that way and get her off you. I use "her" because most griz attacks are by a momma protecting her cubs.
The sight of a grizzly bear in the wild (no fence!!!) is awesome to behold, even from a distance. I had the great fortune to see some at Glacier National Park in Montana and luckily not too close -- they are HUGE, and you realize immediately how frail man is compared to them!
Best,
Brian.
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Brian Jones
Co-moderator
Wilderness & Survival Skills Forum