I went into this tale with the plan that 'What if these two forces were trying to finish each other off, but circumstances conspired against them at every turn?' It was then a matter of finding a plausible excuse for it to be true, and for some reason a night fight in a torrential downpour popped into my head. It's made even funnier that not long into my writing I think it started raining outside. Making them both 'sort of' the same faction (before Acton went Guerilla) also made it initially have a more 'local' scope. At least until I hinted at the possibility that the undead might be happening over a much larger scale.