The performer accidentally threw the weapon out while performing martial arts on the stage? Is it an accident to hurt someone?

I don't think the actor intentionally hurts others, which belongs to overconfident negligence. Because it is serious enough to cause serious injury or death to the audience, it has reached the standard enough to be recognized as the crime of negligent injury, so it is necessary to bear criminal responsibility.

Then the liability for compensation should be borne by the martial arts company where the martial arts actor is located, and the compensation can be recovered from the actor afterwards. If it is really caused by the quality problem of martial arts equipment (for example, the blade of a martial arts knife flies out due to quality problems), the actor should be able to seek compensation from the company in turn, and the company can seek compensation from the equipment supplier.

Beginners of law, please correct your mistakes downstairs.