Edit: So what I’m gathering is that they’re not so dangerous that they will strike out of nowhere, and people need to be alert of their surroundings constantly. They almost always get seen if there is going to be an interaction, and the vast majority of the time just walk away. Is this correct?
I heard it snarl before I saw it. It was chasing a deer, noticed me, stopped and just sat there staring at me about 50 yds away across a little valley, not menacing towards me, more curious. I put my hands on my head to try to “look big”. After a while of us staring at each other, I lost my nerve and backed away and then sprinted away towards a nearby street. It didn’t chase. Based on the ease with which it leaped up that hill after the deer, it obviously could have caught me if it wanted to. Funnily enough I met someone else on the trail just afterwards, told him there was a mountain lion, and he was like "where?"and ran towards where I saw it… This was in southern California.