Walk it off

Walk It Off
Once you gain control of Master Chief, begin following the troop of marines through the jungle. Eventually, you’ll see a waterfall in the distance. As soon as you step out of the canyon, turn right, press the A button and push forward on the left thumbstick to jump over the tree trunk. Your first enemy encounter consists of a Brute and a few Grunts. As long as you are not spotted, the Brute stands atop the tree trunk along the stream. Initially, this Brute has his back to you. Jump up onto the tree trunk, get behind the Brute and press the B button to perform a melee attack. A couple of these should kill him. Grunts can easily be taken out with any weapon, even a simple melee attack. With the marines by your side, the Grunts will likely be taken out before you can get many shots in. With the enemies dead, continue following the marines over the stream. A Phantom appears. It remains only to drop off some grunts and a Brute. Brutes aren’t as easily dealt with, though with allies in your presence one lone Brute won’t stand much of a chance.

Behind Brute

Brute and Marine

SILVER SKULL: After killing the enemies dropped by the Phantom, hop down and move through the trees towards the water in the distance to your right. The ‘Blind’ skull is on a overlooking the water.