An LTMA1 at AMA max allowed speed of 200MPH (293 fps) has the same kinetic energy as a average weight Mini-Cooper at about 22 mph. I'm fairly certain that if a car of that size crashed into someone, it could be fatal. Even with a 2 second shut down timer on loss of signal, that same aircraft will cover 500 feet before the engine stops, let alone how much further it will go before it hits the ground. Now put it at 400 feet in the air -- it can go a very long way.