Fall Through Act 5 Chapter 4 Cheat for Gears of War 2 on the Xbox 360

At the part where you across a crane that just tipped over you kill everyone, then kill the Mauler and take his shield and plant it at the corner where the hooks start to come up.

Then jump over the shield.

You will fall under the map and you can walk around.

When you look up you see the map and there is a Brumak that just sits there at the bottom.