>> the heinous beatdown lasts more than 20 minutes. at times, nadine pleading for help. >> i find it offensive when not one person called 911. not one person called 911. this kid was screaming for help. >> this isn't the first time these bullies have picked on nadine corey. it all starts earlier that school year in september 2010. nadine says he's one of the smallest kids in his class, making him a target. >> they used to say, oh, your mom african. she's dirty. i was with your mom last night. they used to say all kind of stupid things. he says a few classmates continue to tease him, even punching him occasionally when the teacher isn't watching. then on january 11th, nadine is walking home from school with a friend. they notice some of the same kids who bully nadine in class, along with a few older teenagers heading straight for him.