In the new firefight, they need to feature flood with the eerie green mist. you can battle waves of enemies, but at the bonus round, flood come in and take over everyone you killed. Even more can drop in, turning the fight into a task of survival.
To me they sould make another type of firefight, you should be a marine limited not as strong can’t get power weapons from enemies, you know kinda like black ops, but all that.