If I was working late at the office and I saw a child being raped by a co-worker there would be police there in 5 minutes. I would also try to free the child from the situation. As for the coworker, a chair over the head.
I don’t know any details but my daughter may have been in a similar situation to your hypothetical. She’s counseling at a girls camp this week and texted that she had to call Child Protective Services based on a conversation with a camper about something at her home.
Don’t know the details but I’m very proud of her for making a tough decision...probably with much counsel.