You're talking immediately! A couple years ago, my then-six-year-old son, on a gymnastics team, was forever trying to flip over all the bars along the ride wait lines. He flipped over one and I heard a real clunk. It was dusk so I could not see well, but when I checked his head, it was all wet.. with blood! He'd hit his head on the fake but rough "rock wall" under the bar! As soon as we told the employee at the front of the line, we had people surrounding us, including a medical doctor and a nurse with a wheelchair.
My son was fine, the doctor said we could do stitches but he didn't really need it (under the hairline), and he wanted to stay at the park. I was hoping Eisner would open his checkbook, but alas, all we got was a free t-shirt to replace the one with blood drops on it.
Your son was lucky compared to the girl I saw.
She ran up to her friend as if to give her a flying hug, but the other girl ducked, resulting in they flying girl cartwheeling over the other girls back. Her head hit the pavement first with the most sickening thud I've ever heard. She was out, eyes open and motionless.
I still wonder what happened to her.