1. Why not here? He doesn't know this chick from adam or who she has with her, behind, her, etc. She elbowed him, put a balled up fist in his face (which is clearly threatening) and then followed through on her threatening demeanor and swung first. Natural reaction by anyone would be to try to avoid the initial punch and counter back. In what world do you guys live in where someone is taking a swing at your head and you're just super calm, reasonable, and thinking through all possible situations? That's after the fact. In the moment, you react, protect yourself, and ask questions later. She wasn't a small chick.
2. Unless you've seen a different video from me, yea. What else would you call it? The chick hit him at least two times before he ever hit her. If she was a man you wouldn't be arguing he acted in self defense. Or are we making the argument that women's blows can't inflict damage now?