He pushes her in the back several times trying to get to the bar. She tells him to stop, then again more forcefully when he keeps pushing. SHe turns and raises an arm. He grabs her right arm and twists. You can see her scream, seemingly in pain. She throws a weak left to get him to stop. He blasts her full in the face.
To recap: He pushed her in the back, he grabber her arm. Then she made contact.