A 40 lb. kindergartener getting hit with a 9 mm slug is equivalent to an adult being hit with a 1 inch diameter slug. It's more deadly than normal.
but autistics including Aspberger’s can’t tolerate a lot of disruption to their routines. All the running, screaming, bleeding, dying chaos would virtually paralyze an autistic into inaction with the exception of maybe screaming while head banging. I doubt an autistic could hit a target beyond the first shot.