Read the whole thing. Excerpts:
Kopestonsy tried to loose the mountain lion, but the animal stalked her for half an hour.
"I would back up and it would creep forward, so I'd stop. Eventually it sort of crouched down, like part way," Kopestonsky said. "So, I start backing up down the mountain, which was really steep. And then it got up and walked toward me. At the closest point, it was eight feet away."
Finally, she decided to try something different.
"I don't know why, I just started singing opera really loud," Koestonsky said. "It kind of put its ears down and just kept looking at me, and it sort of backed away. Then, it came around the bushes an came towards me again and crouched about 10 feet away."
During the ordeal Kopestonsky had the presence of mind to call her housemate, who alerted the San Miguel County Sheriff's about the situation.