King of the Mountain. I used to play similar games, around the same age, until adulthood. And we never had foam weapons, or foam pits. It was usually, literally a dirt hill. And we bear the piss out if each other. Sticks, rocks, all were standard. I see no problem with this. Especially when the kids are using foam stuff.
When I was 6, I was hit in the eye, with a rock, about the size of a fist. I couldn’t see out if that eye, for a week or so. A kid was climbing up the hill, and hit me with the rock. Then, he kicked me down the clay hill. It hurt. Bit I gathered myself, and went back up the hill, and knocked the kid off. He was probably 10. I was a bit bigger than him. I used to play that game several times a week. This was when I lived in Germany. I have played variations, until my mid 30’‘s.
My sister, rents big inflatable water slides, for family get togethers. When the guys get drunk enough, we play the same game. I’ll knock a 4 year old down the slide. I don’t care. Or maybe I do. No mercy! If someone approaches me, on the slide, I push them down.
It’s tribal, or something. We’re making each other tough. It usually takes 3–4 adult males, to take me down. I love it. When a child starts crying over it, we tell them to get back up there. Sometimes, I let a tiny kid push me off. To make them feel good. It’s a benefit. Not a bad thing… IMO…
The females, in my tribe, are tough as nails. They love it.