To my knowledge, "Trappy" (nickname of the pilot) is one of the best RC pilots around. He flies for Team Blacksheep, and is a big figure in the drone community for encouraging safety, education, and progressing the tech.

He's definitely known for pushing the envelope on reckless flight, but I get the sense that he would take responsibility if something happened.

These flying wings (foam plane model) absorb a lot of force on impact. Even with the GoPros and all radio equipment loaded on. Aside from causing commotion, I think it's unlikely that you'd severely injure someone. Possible, but unlikely. A quad-rotor heli falling out of the sky would really hurt, though.