The only threatening encounter I ever had with another person was in a very remote region of the CA desert. In my younger years, I used to do some solo exploring out in the middle of nowhere. One trip, I'd gone exploring an area where I'd been told had been some petroglyphs. A pretty remote place, about 40 mi from Barstow, almost all on on poor dirt road. It was the middle of the day, not too hot, when I came upon the place, along with a man in a van, looking as though he'd been camping for a couple days. The man seemed quite vigilant, perhaps thought I'd come to rob him or something. Though he looked like he probably lived in his van and didn't have much worth taking.
So I kept my distance, looking around the dry ravine at the rock walls, where I'd expected to find some petroglyphs. The man walked up closer to me, perhaps overdressed for the weather, hands stuffed inside his jacket, and asked in a rather unwelcoming way if I had any business around the area. I remained friendly and meandered back in the direction I came from. For whatever reason, the guy seemed threatened and I got the feeling he was armed and willing to escalate the situation against my favor. Found my way back to my car and cut that trip short.
I've always wondered about this incident. Was that guy just paranoid or was he involved in some unsavory business? Was he just an old desert rat fed up with being hassled by young punks? Was he involved with taking of artifacts, as a few years later, upon returning to the site, I'd seen had been done at one time in recent years. Doubt I'll ever know.
I've always wondered what might have happened had I decided to stand up to the guy. We were on public land, and I had as much right to be there as anyone. It kind of scares me, years later, if I had been armed, and had a little more bravado, and all the youthful stupidity of the time, how things might have taken a different turn.