Your recorded flight data doesn't show any "smoking gun" evidence of the cause of the incident.
There were no abnormalities in the data before it just ends with the drone in stable flight, 270 metres out and 33 metres higher than the launch...
Here is some info for all. I belong to the Academy of Model Aeronautics. The organization is open to all flyers. With a membership, you get liability insurance which kicks in after your homeowner’s policy. If no HO policy, it kicks in...
18 USC 32 answers the original poster's question. Yes, it's illegal to shoot down a drone. Whether or not the law is enforced is a matter for law enforcement and the courts. Our opinions don't matter.