You can actually see how bad their aim is at about 4:30. And at any point can you see whom they are firing upon? Even in closeup view there doesn't seem to be anybody over there.
Oh my god, i recognize that street corner! That was in West Ramadi; I used to do foot patrols around there, and once in a while on a raid we'd find pics/footage of insurgents doing their own foot patrols on the same streets.
And yeah, those guys never could shoot for shit, except for the Chechen snipers and a handful of ex-Republican Guard dudes.