Can the Halfbike go down steep hills?
A few days ago I tried to ride in "down hill" style ;) It's possible, but not easy. The first time I almost flew over the steering wheel :O But if you lean back and crouch, so that the center of gravity shifts as low as possible to the rear wheels it will work. Of course, use the brakes :)
But to start with, choose a slope with a smaller inclination than me. Difficult to survive the first time ;)