in SPARTAN-OPS when you play alone, dead covenants corpses disappear very very fast in front of you, the corpses only stay 10 seconds and then they disappear
but in the campaign you can kill 20 covenants and their dead bodies stay and dont disappear until you go far faraway to other area
a think they must fix this and put the same campaign-skulls in spartan ops
I think that if Microsoft had enhanced the xbox and pc, they could let 343 make the bodies stay forever until the end of the mission. THAT would make Halo more realistic.