I should add that bullets can go through the roof, and this has been documented to happen in some of the incidents of upward-aimed fire causing injury. But I a

I should add that bullets can go through the roof, and this has been documented to happen in some of the incidents of upward-aimed fire causing injury. But I agree with the idea of aiming towards locations where the bullet is likely to penetrate but not go through. The ground might be dangerous because of the potential for ricochet - but many other surfaces could be adequate.