This happened last Friday on a trail in Trabuco Canyon, California, which is about an hour south of L.A. A couple of hikers noticed a mountain lion had been stalking them from about 20 feet away.
One hiker started yelling “get back” over and over . . . and told his friend to slowly back away, which is what you should do when confronted by a mountain lion. The couple said the cat followed them for a while and then wandered away.
(WARNING: There is an immediate F-word, plus other profanities throughout.)