From the article:
The 15-year-old girl and some friends were walking up the street when they saw a classmate with another group. The victim and her friends turned around to leave the scene but the classmate rushed up and allegedly hit the victim multiple times from behind.
The 15-year-old was knocked to the ground where the classmate and a younger sister continued the beating, according to police.
At this time a two other girls pulled up and jumped out to help defend the victim as other tried to step in to end the fight.
But, police say a man in his 20s came up to the rumble, pulled out a gun and said that he would shoot anyone who stepped in to stop the fight. The girls then stood by as the victim was beaten further by the sisters.
When cops arrived the man with the gun was gone but someone had recorded cell phone video of the street fight including capturing the man with the gun.
One of the alleged attackers was arrested while the victim got some medical attention for bruises. Neither girl was identified since both are juveniles.
.The man who allegedly had the gun was later identified as Karl Slater, 22, of Darby. He was arrested Wednesday and arraigned Thursday on multiple counts of simple assault, terroristic threats and weapons charges, according to court documents.