I learned that only by getting two guys to dive out of a helicopter (that somehow got up to about 50,000 feet) and then plowing them into the ground headfirst can you get a dragon to chase another guy along the ground by riding a horse. This third guy does NOT, apparently, need to dive out of a helicopter. Into the ground. Because the dragon will chase you anyway. While you're on the ground.
It's like a studio exec lost a bet or something, the fact that this movie got grunted out into the bowl.