Our eyes cannot comprehend what modern lenses produce.
If this was taken by a photographer as close as a anyone with a normal camera would be standing, then the photographer is very stupid as he is virtually in the line of fire. - a slight swing of the barrel and ---
If the photographer used an extreme telephoto lens then the crowd beside the shooter could be 20 or thirty feet away from him.
We can't believe that any photographs these days truly represent what our brains assume that they do.
Looks like a mild telephoto to me. The guys in back are slightly out of focus and could be as much as 20 or 30 feet from shooterguy.
Unless the shooter were shooting through a portal or a narrow place between buildings. The fauxtographer could be using another wall for protection.
I still say its staged.