Not much of a plot. But more like some cool story of why there is a warzone firefight rather than Palmer saying “Battle as many enemies as you can to achieve victory”.
Should be more like there is supposed to be a normal warzone game but there was a malfunction and 6-8 Spartans went into the fight instead of 24 and the spawning of the enemies got broken, which lead to wave after wave of repeated enemies coming in until people fix the problem… which is when the timer runs out… or when we beat it or we lose.
Palmer: “There is a malfunction in the system. Spartans, hang tight until but everything back”
And that is when the ‘broken’ spawning comes in… and the 6-8 spartans must fight their way until they win or lose. It will make the plot more interesting and feel like you are actually surviving than just fighting for the hell of it.