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This Video might help you. You must be riding a wall while killing three enemies without dying in between the kills. To clarify, you need to be wall riding when the elimination happens and you receive the notification on your screen. What the guy does, and seams to be easier is to push them off the map and just ride till they hit the bottom.
Its really easy if you can finish the game and unlock the police man, as he can carry bodies without suspicion. Just pick them off while their alone and carry the body to a hiding spot (a good one being that corner on the outside of the building beside the bathroom. DGarvanski is right about both the map and that the disposing of bodies is counted as a trap, ...
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