I thought Horse Walker might just be oblivious to the race, so I called out, "You're in the race!" To which she responded, "I'm crossing the street." (Whatever she was doing, there was no crossing apparent.) And then she retorted, "Mind your own business, please." Now, I'm not a nosy person, but when you're doing something that spectacularly idiotic, it becomes everyone's business.
Most pedestrians are pretty careful around cars, but when it comes to bike paths, they inexplicably treat them like sidewalks. Bike paths ARE NOT sidewalks. Think about it this way: if there was no bike path, cyclists and skaters and joggers would be riding / running in the road, alongside cars. So unless you're prepared to walk your dogs -- or push your stroller -- in traffic, stay off the bike path.