It's not the whole dissappearing act while avoiding the 15 second retreat time. I just thought it was supposed to be as soon as the spite becones invisible the guns weren't able to be fired.
And by hacks I really mean...
***EDIT***
I want to make this clear; it's not the person that did it that I really care about. I played a test mission and anyone can be in the blacked out, shadow area, on the border and still fire their guns.