Unless the frizzy haired girl has arms that are 6 feet long, she could not be the one. She’s too far back when it starts. Watch the one with the blue ski hat. She bends down behind the girl with the yellow jacket and disappears right before the girl’s hair catches on fire.
Watch it in slow motion.
She’s in the right position to be the assailant. The only other one in the frame attired similarly would be the fat guy in the hoo-hoo hat.