The tail end looks like a good shoot, you've got disparity of force, but really would like to know what started it before making a final judgement.
As long as Ung wasn't drinking, looking for trouble, he should be in the right. Which is nice, but you can be in the right and still end up in jail. What scares me is the shootee sounds like he's related to the political establishment. The media is hyping the guy that got shot "he stepped in front of the gun", captain of the lacrosse team, etc, like he's some sort of hero.
He's lucky it was caught on video, that's something to go on rather than the shootee's buddies' testimony.
I sure wouldn't want to be in this guys shoes.