I've killed two by grabbing them from below but neither of them counted. How many people do you need for a chain Takedown kill for it to count 2, Three? I've gotten three two people kills and none of them counted. And Just how do you do a Pistol takedown kill? I've shot several in the head;some with the .45 and some with the revolver;None of them counted. Is there a way I'm suppose to Pistol Whip them to death, is that it? These three Challenges are the only ones I've not completed. What little sanity I may have left is ebbing away HELP!