Think he was a bit late on it. I get that he got hit below the belt.. twice. But still im pretty sure the almost insta KO from punches got the point across and the guy looked pretty much out before the knee.
He should be a video game fighter character. Like SNK and Capcom fighters. His special move would be the triple nutt uppercut. And make inside the train his home turf background scene
the way it looked: the old man being an ayhol spreading the paper into the young man's comfortzone while he was on his Ipad. The young man pushed it out of his comfort zone(like wtf? Im a person here too) and the old man looked at the kids face and not fear a chlid he see that disrepect him with that manner. So he punched him
The old man looks like a trouble maker. And looks like he's a pro at low blows. That' his weapon that's why he don't fear the kid in his home turf. The train's bench
How woud you like to be minding your own business and have a stranger like that do that to you?