So, from the video in the OP, it doesn't appear to be "that bad", but when you watch the full video (below) you can see him go over a kick her and knock her over. That's where I can no longer defend any of his actions.
http://www.tmz.com/2018/11/30/kc-chiefs-kareem-hunt-attacked-kicked-woman-surveillance-video/
http://www.tmz.com/2018/11/30/kc-chiefs-kareem-hunt-attacked-kicked-woman-surveillance-video/