I'll do the best i can...umm
Map: Countdown
-In bunker 2 (located on the right of the actual picture of countdown when the match ends) When you walk into the bunker through the big opening (if you look up you'll see the number "2") Right when you enter it turn to the left and you should see a stack of boxes. Alright now look for a box that is rested on one of its corners kinda looks like a diamond. You need to get in that little spot between the 2 boxes. You will basicly be floating. Simply get 2 kills there in a cage match or somehting and VIOLA You did it!
I hope that helps...if now feel free to ask for help. =)