If I didn’t ride alone, I would hardly ride at all. While there are many aspects to staying safe while riding, this video deals with mounted self defense. I’m lucky in that I live in a very safe part of the country and ride trails that have very few people on them. It is very, very unusual for me to encounter someone unknown.
The gist of the advice is: If someone grabs your reins, turn into them and go forward as fast as possible. Keep spinning into the attacker until they release the reins. Then get the hell out of Dodge!
Good reason to practice those one rein stops and turns on the forehand. Of course, anyone who thought that Zelda might step on them would back off right quick. She could squish an attacker like a bug without even meaning to hurt them.