Ok got to headlong. on headlong go bye the soda machiene tip it over with grenades now jump on it while your on it press right triger three times making sure you only shoot three amo.then jump off run to a warthog any one and go off the broken road bridge thing when you jump turn to the right and land on the swinging platform get out of the warthog and jump on the metal bar in front of you and blow your self up with a grenade when you fly off the metal bar turn off the xbox then on and go back to headlong then go back to the soda machiene its should be floating duck and go underneath its you should fall through the ground and when you look up the ground should be right in front of you and your floating in mid air this way you can kill people and they cant kill you and to get out go underneath the soda machiene you can see bottom of soda machine and jump and youll be back on ground and this is how i got ultimate hiding spot you go under a box in the open and jump and youl fly up to the highest building this glitch may not always work.