No. He did not 'go to get help'. EVERYONE has a cell phone. Even when I lived in Nigeria they all had cell phones, most had three or four. He could have gone down to her to attend her injuries and call for help with his cell phone. That guy did not want to be involved. She could have died if no help came. He just left her there.
@Oceanslider is right, I would have stayed around and call for paramedics to arrive. Good thing there are cameras everywhere. Pretty sure that guy called paramedics Need footage for what followed after