Can someone explain how to get the last skull for Halo 3?

[Long RodVon Hugen Mire]

will it appear on the bridge or somewhere next to it?

 

[Ice C]

IMPORTANT! START FROM THE BEGINNING OF THE MISSION, ON NORMAL, HEROIC, OR LEGENDARY IN ORDER TO GET ANY SKULL!

The Skull is located in the level, “The Covenant”. After defeating the Scarabs, and going inside, get to the location with all 7 Ring Holograms. You must jump through the rings in a specific order. That order is as follows (1 is at the entrance, 7 is at the end):After jumping through them in this sequence, you will be awarded the “I Would Have Been Your Daddy Skull”. It will be right next to the bridge that brings you over to the Prophet of Truth.

NOTE: YOU MAY NEED TO KILL THE PROPHET OF TRUTH, AND THE FLOOD BEFORE DOING THE RING JUMPS!