I like to think that I am semi-cautious and aware of my surroundings, but $hit can happen unexpectedly to anyone. I have had numerous occasions where I was hurtling down a sweet piece of trail only to notice hikers or bikers just ahead of me. After I slide to a halt and the dust clears, pleasantries are usually exchanged. With horses it has almost always been different. Too bad there aren't more people that ride both MTBs and horses. I assume most of the equestrians I have encountered on the trail have been the same people that tried to run me over with their F-350 as I peddle through Sugarhouse.
If I couldn't control my bike (or be willing to accept the consequences of a fall) I wouldn't ride the trail. I know that I am a vindictive, smart-ass, bastard that only antagonizes bad situations like this and makes them worse. I'd rather just avoid the situation. That's why I refuse to ride Corner Canyon.