If she knew he had an air rifle with the child around, and suggested he fired it, to frighten the little chap into shutting up , then she surely has to take some of the blame.
Why do parents use this 'shock treatment' to make their children go quiet. That is also cruelty !...
Humankind has not woven the web of life. We are but one thread within it. Whatever we do to the web, we do to ourselves. All things are bound together. All things connect.