"Bystanders" is probably the wrong word. I meant people not participating in the filming.
The failure in the stunt was that the cannon fired at an unexpected angle and the ball did not embed in the berm as they expected. If they had chosen a location where a ball fired at maximum velocity and at the worst case angle could not hit a person, that failure would have any negative consequences. So (I think) it was reckless to try to manage the trajectories at a less safe location.
The failure in the stunt was that the cannon fired at an unexpected angle and the ball did not embed in the berm as they expected. If they had chosen a location where a ball fired at maximum velocity and at the worst case angle could not hit a person, that failure would have any negative consequences. So (I think) it was reckless to try to manage the trajectories at a less safe location.