The range necessary to avoid danger from a thrown rock isn't all that great. One can simply pull back far enough that in order to continue throwing rocks with any chance of sucess, the person has to cross the border. Once they do cross the border and try to throw a rock, they can be blown away to th eBorder Agent's heart's content.
Not if the "retreat" is done intelligently. It's actualy just falling back to get into a better defensive position.Look at it this way... If simple rocks could make the border patrol retreat, it would be even easier to cross this border, no?
If the rock throwers are on their side of the border, there's no problem. That's where they are supposed to be. Let them throw rocks ineffectively if they wish. Like a small child crying, they'll tire themselves out eventually.
Or they'll actually cross the border and get arrested or killed for it.