We have quite a few of them in the area I hunt, and a hunter was mauled just down the road from my cabin last fall. He was headed home from an elk hunt and surprised a bear on its kill. The bear bit him and took off, which resulted in him losing a finger. He and his partner had spray, but they said the entire attack from beginning to end probably lasted 15 seconds. The partner did try to spray the bear, but only hit it as it was leaving.