different wrist holds to get her to comply. things escalate when a second teen, 17-year-old angel rosenthal, jumps in to help her friend. >> a boy in a blue shirt grabs rosenthal but she breaks free and gets in between officer walsh and her friend pushing walsh back. >> anytime you put your hands on or assault a uniformed officer, you're going to expect that there's going to be force used against you. >> officer walsh attempts to gain control of the situation by first grabbing rosenthal's right arm, then delivering a swift right hook to her forehead. >> greg goolsbee is the cameraman recording the scene. >> i thought it was going to get to a point that he knocks her out on the ground.