destiny cooke , 16 , and lajahia cooke , 17 were beaten by a mob in trenton .
lajahia said one girl ripped out her earring and then girl 's mother threw a rock at her ear , which required 12 stitches .
destiny has a bald spot where someone grabbed a chunk of her hair .
people can be seen holding the girls down so others can punch them over and over again , while the crowd laughs and cheers .
destiny said as the sisters walked out of the park the police ` just stayed in their cars and just looked at us '