halo 3 iwhbyd skull help.?

[Skater D]

i found it one time and picked it up but i turned the game off and forgot to save. XD. so i went and did the whole jumping through rings and everything again but the rings wont blink or flash anymore and the skull wont come back. i found it once so i now where it is how how to get it but it wont show up. M i doing something wrong. and will u tell me the order i need to jump through again i cant remember. plz help

 

[cast my cat or else]

order is 4654534 1 being where you eneter 7 being closest to where the flood turn on you watch the clip of teh arbiter killing the prophet and then kill all the flood (all flood need to be dead) and make sure no skulls are on difficulty normal or higher