Has anyone ever played any of the firefight campaign missions before. One of them is one is on Winter Contingency and the other one is on Long Night of Solace. The first one is the part where you hold your ground when Kat is hacking into the building. The second one is out side the building at the front enterance and by the docks. You don't really get points, but it can be a challange. They just keep dropping off men over and over. In the second one, you get a bunch of marines to help you. They are actually quite fun if the difficulty is high enough. Just to say there is limited ammo. If you know of any more, please tell me.
I think he's reffering to areas in the campaign where there is an infinite number of enemies. From my experience, I haven't come across any others aside from the one on Long Night of Solace.
I would work on being clear about what you mean. Sentence and paragraph form. I still don't know what you are talking about.