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In order to make this trophy / achievement pop you will need to throw the smoke grenade directly at the enemies. When you throw it at them they will start to

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i.ytimg.com/vi/ndKdGTsW9bA/hq720.jpg?sqp=-oaymwEhC

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i.ytimg.com/vi/UAlaseivO6g/hq720.jpg?sqp=-oaymwEhC