In the scene where Bianca shoots the gym teacher in the butt with a dart, her classmate drops her bow and runs for help. The girl runs until she thinks she is out of the scene, but if you notice you can see her standing around in the background while Bianca finishes her conversation with Joey.
Actually, if you notice before then, Bianca's friend is with her when she's shooting. If you notice next to them, there is a girl who looks very similar to Bianca's friend. That's the girl who goes to help the teacher when he gets shot.
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