I was in a public match like this on CoD4 back in the winter. It was FFA and when I joined there was all this wierd text on the screen like "Derank" "Take XP" or something like that and all the text was red. I backed out immeditately and nothing happened to my rank. So strange how hackers mod so easily to this day on XBL. It's been out for what? 6 years now and they still can't ban hackers.