WHAT the HELL was this guy thinking?!!!
Too many questions, not enough answers. Why did he not check if the truck is in gear, why is the parking brake not engaged, why did he leave it in reverse when parked, shouldn’t the vehicle have a clutch safety switch, so it won’t start if the vehicle is not in neutral or the clutch is not pressed?
He was not thinking straight might be an answer to all of the questions above. Either way, that’s a lot of damage that could have been easily avoided.