The whole prey predator thing is greatly overplayed. I've worked with feral and abused horses that are able to get over the thought that they might get eaten relatively quickly. I don't find that most people approach horses like a predator would, I find people that approach their horses similar to how they would approach a car, thinking that this button should do this and that button should do that instead of looking for communication from both sides. When the darn buttons don't work, that's when things start getting confusing for both parties involved.
When I was 13, I was sent into an 18 acre open pasture with 12 horses in it to catch one paso mare that was afraid to be caught. My trainer sent me out and said "if you want to work with the horse, you have to catch it". Now, I know catching it was the biggest part of the work and you figure out how to be "natural" pretty quickly when your tools are you, a halter, and a herd of horses for a few hours to catch the flightiest of the group. There wasn't anyone there to teach me about their language, I simply figured out what made them run and what made them come, learning my lines and knowing when to push and when to wait. It seems that most people I meet with horses now only want answers given to them, they never want to figure them out, the think that it all must come with an instruction manual.