The guy filming heard that protesters at a Los Angeles Trump protest on Veterans Day were burning and destroying American flags. He went under cover to save one and to voice his disgust at their disrespect for their country:
He says,
I went out to the Los Angeles Trump protests on Veterans Day because I saw they were burning and destroying American flags. Decided I was gonna go undercover and try to save one. Found this guy dragging and stomping on one. Waited for a good escape route, then went in to get it. It was my intention to grab it and run, but this guy came right at me. I wasn’t looking for a fight, but he pulled a taser on me. He got me a couple times, but it was just annoying. You can here me grunt as I punch him in the face. Took no damage. Opened him up a little. Oh well. My love to my brothers and sisters who have served and given the ultimate sacrifice.
H/T Liveleak