I'm with ya about the Court's and Police time wasted...up to a point. That seemed to be a potentially serious and lethal act for an 11 year old to carry out against an 8 year old. Kids do dumb things but that rock weighed 2 pounds!!.
In 6th grade I was involved in the usual boys chase the girls, girls chase the boys on the schoolyard playground. We were all chuckin' stuff at one another and I picked up this flat rock about the size of a quarter and hucked it in the general direction of the lineup of girls that was persuing us boys. The thing flew threw the air zig-zagging back and forth out of control and drilled the girl I had a crush on for most of my elementary school years right in the front tooth and chipped it! I could hear it from probably 30-40 yards! Oh man was I dead meat.....until the code of the school yard kicked in. She didn't tell on me and I didn't say anything. It all went away. But a 2 pound rock?
Ya notice the common thread here? How kids are just getting more and more violent and at a younger age? It's scary!