Gears of War 2 - Do a bit more sniping to help Dom out. Continue forward. A couple of cars will roll off of the level you are on. It will create a ramp down, so you can rejoin Dom.

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Do a bit more sniping to help Dom out.  Continue forward.  A couple of cars will roll off of the level you are on.  
It will create a ramp down, so you can rejoin Dom.