Thanks guys! When I got to about 20 kills, I got so nervous and just camped my ass off. At that point they kept trying to sneak up on me but it didn't work. I don't think I even took a breath for a good minute and a half and my hands had a death grip on the controller. And of course, didn't have theatre mode on but at least I've got witnesses.
I was using an L86 w/ red dot and silencer and just kept changing positions while staying around the A dom area.