Attrition does this. So why not Last Partan Standing? I was there, spectating a match until its completion (to see where my challenges stood after a few games of leaving early), and the game went about 15 min. 5 of those were two spartans, one above and one below. It was the attrition of patience as the lower one ventured forth into the miasma in order to climb up to the other guy. He made it, but his shield was gone and he sacrificed his body for the sake of the world.
I’d like the danger zone to eventually cover everything and end it all.
Also, reducing the safe zone a little quicker would be nice. When you end up with 5 or less Spartans early, and the danger zone takes just as long to reduce, it makes finding people a drag. Maybe the speed in which the safe zone shrinks decreases changes based on the # of spartans remaining?