Right, it's just staged. Why would they go to the trouble of finding some people and having them look like they are near someone firing and then find a guy firing and painstakingly pasting him in? Just get a real guy firing by a crowd. There are plenty of gunmen around.
Also, there are probably ten photographers lined up taking this shot. He's probably firing at a tree.
DEFINITION
The term "Pallywood" refers to the staging of scenes by Palestinian journalists in order to present the Palestinians as hapless victims of Israeli aggression. They are able to succeed in this endeavor in large part due to the credulity and eagerness of the Western press to present these images, which reinforce the image of the Palestinian David struggling valiantly against the overpowering Israeli Goliath. Pallywood has led to astonishing lapses in Western journalistic standards in which badly staged scenes regularly appear on the news as "real events." This page attempts to outline how such lapses could have come about, producing the current situation
http://www.seconddraft.org/history_pallywood.php