Given his performance-nature of his stunts, think of it like the guy who juggles chainsaws, a not-recommended use of the device, that could, and in this case did, lead to injury and death.
Actually, juggling chainsaws, while somewhat dangerous, isn't as bad as it looks. Even though the motor is running, the chain is not moving, at least with a stock chainsaw. You have to press on the trigger for the chain to move. Fucking safety interlocks, how do they work?
You mean it wasn't just a viral advertisement for next year's "average guy hunted down by the government for knowing too much" blockbuster movie?
"Enemy of the State 2: Electric Boogaloo"