Towards the end of the video, the officer in fact alleged she had kicked him. It's not clear to me when that happened. Possibly her foot scraped his leg in the initial scuffle to pull her out of the car. Alternatively, it may have happened in the portion that is off video. Either way, the female police officer noted evidence of the scuff, presumably on his uniform. Incidental things like these seem to be taken as evidence of "assault" all too often.