I HATE these Bloodthirsty medal challenges LOL
I have about 500 of these medals now and I have no trouble getting them over the course of regular play, but when it comes time to unlock the Skull camo on a weapon... holy shit.
Maybe I then put too much pressure on myself, but I seem to be great at dying on exactly four kills. Doesn't matter how great the previous four kills were... someone will spawn behind me, I get hit by some score streak, or I just plain **** it up myself. I've even gotten a few medals where I got some of the kills in the first half of a DOM game and the rest in the second, without dying along the way, but I guess the half time break then keeps them from counting toward the camo.
Reminds me of MW2, where the few times I tried going for a nuke, I ALWAYS died on six kills, one short of a Harrier, or even five if I ran Hardline, while I had no problems getting more kills when I wasn't going for a nuke. The one time I did get it, I forgot I was even running the nuke setup, and I was just goofing off with the M240B.