“gunned down protesting”
What a load of bull! If he had stayed home with his girlfriend and child, he wouldn’t have died.
The barely disguised subtext here is the young man who shot the scumbag is a knuckle dragging, gun toting Yank who supports the evil Orange Man.
Gunned down as a result of attacking a person who was fleeing from him and other thugs. That's more accurate. All Rosenbaum had to do to stay alive was chose not to attack Kyle Rittenhouse, who was running away from him.
You can see it happen here, the end of the video is pretty gruesome so be warned. Rosenbaum runs in from the left with his red shirt up around his head as a mask, chasing Rittenhouse.
There do appear to be shots fired at times where it would be unlikely that Rittenhouse fired. It is difficult to know what is happening then.