First ever most dangerous curb stomp

The first ever most dangerous curb stop happened at PMS or Plattsmouth middle school in NE when a kid beat the crap out of another kid as the kid started to crawl away boy picked the kid up, opened his mouth and set on the curb and slammed his foot down on the back of his head breaking the teeth or shoving them into his head while the teachers stood inside not doing anything. I know i went to this school.