In my experience I have had this actual incident occur. When I spoke to worksafe all they were concerned about was if there was actually anyone in the vicinity in immediate or imminent danger. They did not discuss barriers or any other control that was in place. When I described the scene, and the closest person they were comfortable and I was not required to report.

We as main contractors also follow this process. Main reason is the sub being responsible for the works is the one experienced, therefore if required by Worksafe to query safe practices/incidents they are aware of who is controlling this area of works.