Halo 3 Catch Skull?

[pennapredator22]

i have everyother skull and the catch skull is the only one i am missing. i tried everything. i left the wraiths alone, i tried killing the AA wraith, sniping the gunners out, everything. everytime though i left the wraith at the door alone. everytime i get ontop of the barrel, the skull isnt there. can someone help please?

 

[Steven]

I had the same problem. what i did was I went on and found the other skulls and then came back to that one. And I killed everything in sight so i don't think that makes a difference. But make sure you start from the beginning of the level. And if doesn't work after that i don't no what to tell.