He was not properly licensed to fly the drone and did not abide by the rules to stay a safe distance from people, he's liable for the injuries (if there were an

He was not properly licensed to fly the drone and did not abide by the rules to stay a safe distance from people, he's liable for the injuries (if there were any). How would channel hopping allow someone else to control the drone? I always thought that "channel hopping" was to prevent hacking. Wouldn't the drone and controller communication be encrypted with a key shared between them? What is the standard thing for drones to do when they lose communication? Do they return to the spot where they took off or do they simply hover until communication is re-established? I would hope that they're not designed to simply drop out of the sky.