LO and I went to the park after daycare pickup today. We sat on a blanket near the playground like we usually do because she loves watching everyone. Today there was a boy about 6 that wasn't playing very nicely. In fact, he repeatedly came over to my blanket and warned me that he was throwing sand bombs and so I should protect the baby. I thanked him for his concern about LO and told him to be careful of all the children. He kept throwing "sand bombs" and visited our blanket a few more times. I could see a bunch of mothers scowling at me.

Predictably, one boy got sand in his eye. His mom stomped right past my blanket giving me the evil eye. Obviously if he were my kid I would be doing a piss poor job of watching him. But he isn't. My kid wasn't even playing in the sandbox, she was in my lap. She doesn't even crawl yet so I thought it was best not to police the playground.

What would you have done?