In this case, the fellow claims to have yelled at the bull, stopping him in his tracks. I imagine it depends on who you ask. Carl Lewis would likely answer, Run. But this does not help the rest of us, especially if you are laden with a backpack and sporting knee braces. I like the yelling idea, but I have also heard that it is best to become passive.
Most people do agree on one aspect of bull psychology, though.
Bulls are agitated by the color red. So be aware of your wardrobe, and be sure to hide that little limp you have had since Grasmere - they always go for the injured ones first. Upon crossing each pasture without incident, you will be confronted with the challenge of a stile, by which you enter the next pasture. Stiles come in many styles. Others are similar to turnstiles, with spring-loaded gates.