The video opens with a scream and Jia Li Riddell being slammed against the pavement by a police officer.

She doesn’t appear to be resisting, except that her back is turned to the much larger officer. And just as easily as the 15-year-old went down, she’s yanked to her feet by two police who slap a pair of handcuffs so tight against her wrists that, days later, they’re still bruised.