Hiker chased by mountain lion in US, roars to scare it away; video goes viral

A viral video shows an encounter between a hiker and a mountain lion, wherein the hiker can be seen running as he's chased by the mountain lion. The incident occurred on January 8, in Los Angeles, US. The video then shows the hiker screaming at the mountain lion, making a loud roar and scaring it away into the bushes.