This is a generic FUD-ism that doesn't seem especially relevant to the topic at hand. If somebody is flying five feet over the ground, a car windshield bumping them at extremely low speed is probably not in their top 10 biggest concerns.
I worry for protruding objects in garages, but I don't see how anyone's bones are in danger here.
Can you explain the actual danger you're imagining rather than trying to be pithy? Because I have no idea how you envision this "breaking through skin." The car isn't even moving fast.
