Snipers* are pretty much crap for morale. I'm sort of surprised this doesn't happen more often. I can't imagine there is a big shortage of older Russian rifles laying around that insurgents can take potshots with.
*I use this term in the sense of "person who shoots from concealment", not highly trained marksman/reconnaissance operator. I was unsure if all the shots he was taking were from the quoted 600 yard estimate or if he's moved around a bit, but hunters out there that can hit a 9 inch (pie-plate size) target inside of 400 yards with a little practice aren't uncommon.