What should you do if you meet a Mountain Lion?
Never approach a mountain lion especially one that is feeding or with kittens. Most mountain lions will try to avoid confrontation. Always give them a way to escape. Don’t run. Stay calm. Hold your ground or back away slowly. Face the lion and stand upright. Do all you can to appear larger. Grab a stick. Raise your arms. If you have small children with you, pick them up. If the lion behaves aggressively, wave your arms, shout and throw objects at it. The goal is to convince it that you are not prey and may be dangerous yourself. If attacked, fight back! Generally, mountain lions are calm, quiet, and elusive. The chance of being attacked by a mountain lion is quite low compared to many other natural hazards. There is, for example, a far greater risk of being struck by lightning than being attacked by a mountain lion. Report all incidents to a park ranger.
From the National Park Service