It seems that once they go into defensive mode, they aren't moving. I've pitched pine cones, sticks, small rocks, and soaked them with water. It just pisses them off more.
If they are sleeping when you come by, get by quickly before they become aware of your presence. Once they are alert, the odds of getting by safely diminish. A lot of times they do come down and lay on trails that have been cut into the side of a mountain or ridge. When that happens you can't go up or down to get by them.