Five boys playing at a house, three of them age 9, two of them age 6. Two of them are siblings, one older one younger, both have behaved appallingly all afternoon (chucking food, deliberately annoying the others etc). It’s their house.
Later on the boys all play pillow fights in the playroom/den and a pillow hits the light fitting, breaking it. It’s repairable. The pillow was thrown by one of the older boys who has behaved well all day. It wasn’t deliberate. All the boys were throwing pillows.
Would you bollock the boy that threw it? I’m not a parent of the key players but I was there and I want to see how people would react.