The Shooter broke federal law and as such you need to contact the Federal Aviation Administration and report the incident. They are the ones who have jurisdiction over this case. It is illegal to shoot at any aircraft in the air, regardless of aircraft type. It makes no difference where you were flying or any of that. You could possibly be held as well if you cover up the crime and do not report it to the FAA. You could be seen as a co-conspirator in the shooting by not turning this guy in. Do not get the camera fixed as the FAA will probably want to examine lens and picture/video. The FAA can call in the FBI/CIA forensics teams. There very well could be more to this shooting than just some neighbor pissed off. For instance, what if the shooter is trying to hide illegal activities such as drugs or even Terrorist activities, so your drone got shot in response. It may sound far fetched to some, but better to be safe than sorry.