That is the kind of behavior that gets people hurt. If you take it out of the air and by that i take you to mean shoot. Then you are breaking the law by shooting a fire arm (in city limits, i say this because that is more then likely where it would happen) also by doing that your stray bullet could fall onto and harm or kill another. additionally by taking it out of the air you make the quad itself uncontrollable so the incapacitated quad would run the risk of damaging property or another person as it fell to the ground. All in all it would be illegal for the quad owner to fly in a location were this situation arised but you yourself give way to much more lethal and dangerous possibilities by taking that kind of action. Not to mention your illegalities are much more extreme.