I hack out alone a lot. My horse is a very confident hacker and we meet all kinds of wildlife (moose, deer, wild birds, hares, etc.) and vehicles in our rides, he is also sure footed and can be trusted in risky situations. We can cross water, ditches, fallen trees, we can go over almost all kinds of terrain - just point and go.
However, even he sometimes spooks or gets scared in strange, new environment - then he plants in place and tries turning home, if it's a medium scare, or, if it is a major spook, he may also jump in the air and sideways, he once reared and tried galloping home. Luckily, all it takes is to lean closer to his ears and breathe out loudly, maybe also say his name in a soft manner. Then he calms down and stops. The most important thing with him is being confident during the ride, because he's known to buck or bolt with scared riders or those who lack attention and focus - then he takes the matters in his hands. So I just sit tall and look far in the trail, breathe deep and feel good about anything that awaits us after a turn or in a new part of trails. It is a fantastic feeling, when you can gallop safely down a road your horse sees for the first time in his life.
I have come a long way, to surrender my shadow to the shadow of my horse.