Okay is it normal for farmers to just run out and dump things in their field? I could see how someone could mistake that as a weapon. Especially considering that after the first guy is shot, the guy behind the tractor starts unvieling it. I'm sorry, but if you get the urge to run out and throw a rake in your field, I doubt very seriously if you are going to worry about taking it out of its case when you're being shot at. The rake on the ground is going to be the last of your concerns when 30mm cannon rounds are blowing up around you--unless, of course, the rake is an RPG or something you percieve an eliminate the threat. That is about 2:30 into the video, BTW. Check the youtube link. The guy is crouched behind the tractor, or whatever it is, taking a blanket or cloth or something off of a long tubular object when they smoke him. In fact, if you look closely to the object when he is running it out into the field, it looks like it has a carry handle. How much farming equipment has carry handles? I know the PKM usually does...
At any rate, it is enough that you couldn't blame the Apache guys for mistaking it as a weapon.