Oh, do you really think that somebody going through the trouble to do this is gonna use an SKS to try and snipe people from buildings, this guy was Army trained, he understood weapons and what a particular weapon is suited for. An SKS is a short range Riffle, it is not a precision riffle.

Any 10 year old kid who has went to the range a half dozen times could be lethal from a high rise with a low quality hunting Riffle and scope. But even a highly trained Navy seal would have trouble effectively hitting targets from any amount of distance with an SKS.

Plus from the cell phone video you could hear what sounded like automatic fire or at the very least "bump shooting", No automatic weapon or semi automatic weapon is very accurate when shot like like, you pretty much could not hit the broadside of a barn.