It is tragic and most likely avoidable. I think that 3x pilot has bigger chance to get killed or seriously injured in trike or hang glider then total beginner with just mental knowledge. I remember TV program “60 Minutes” in ’80s showing how airliner professional pilot killed himself in a trike. Everything is in reverse and slow reaction. Trike doesn’t like to be pushed around. It likes to be handled gently and patiently. My 5 cents