So, timeframe wise, this video is clearly well after (not during) the “shooting” took place. There’s no way in hell info travels that fast to get that many parents there while the shooter is still active. Unless this went down just as parents were starting to pick up kids after school? Plus, it takes a good 30 minutes before police tape is put up and that’s usually only once a crowd starts to assemble. Sadly, by this point there would have been nothing for the parents to do to prevent this.