Let me set this up for you. Kendall likes to enter one end of the playground, climb all the way through the obstacles, and then exit done the long swirly tube slide, and then repeat about 20 times. The first scenario was when she was knocked over by an 8-10 year old boy who was playing baseball with his friends where all these little kids are sliding. I immediately tend to Kendall and tell this boy to be careful around the smaller kids. I know I am that mom. I can't help but be all mama bear/teacher-esque when kids aren't following the "rules".
I'm all good, cooling down from an almost interaction with another kid on the playground because his mom reacted. She did what I would have done if it was my son.
Fast forward a few minutes later and Kendall is once again at the top of the swirly slide, except this time a little girl has hit her in the face and she's almost to tears. I lunge over to the slide and I proceed to tell this little girl, " No, we do not hit other people". I grab Kendall off the slide to console her. As this is going down, the SAME mom I was just talking to, realizes the child who just hit my child, is her youngest child. She pulls her kid off the slide and sticks her in timeout.
At this point I'm all, " Great talking to you, but we have to bounce" before another one of your kids bullies my kid. And we left. I talked to Kendall about what happened. I made sure she knew that girl shouldn't have hit her.