or they coud always make it so there r induvidual missions and its like one perosn playeys bad guy and 1person plays good guy. or like on halo where only if both of u die casn u lose the game.
in other words u have the option to ressurect ur buddy.
this probabl;y makes no sense to u but then no ones perfect <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />