+1 for free pie.
The few Amish that I've interacted with seem very similar to the Mormons I grew up next to - if you're their neighbor or at least in the local circle, you get benefits of free cookies, muffins, jams & jellies in canning season, and protection from missionaries, and I suppose a hand erecting a barn. They're very kind, and community oriented. If you were to approach them in a neighborly manner to say, "hey please be more careful about leaving obstacles in the road (i.e. invisible ones) that might damage my motorized horse", they would likely be welcoming of your concern. Since you dinged your bike, I'd push for some free pie or at the very least some secret family recipes. Those are like treasure