Originally Posted by Skipsfirstspike
Ideally you should hold on to your rein, even if you fall off. Easier said than done, lol!
Never, never do it! If you fall, hold the rein and horse freaks out next you'll have is horse actually stepping or striking at you, which may lead to really bad injuries. I had it happen with me once and I've seen it happening with other people. Just let it go - most horses will stop especially if you ride with someone and other horse stops.