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.