Kill an enemy while blinded by a flashbang in the single player campaign

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Easiest to do on the Recruit difficulty on the Crew Expendable mission. After your team takes out the enemies in the captains room, head down the stairs before they do. There should be a drunken enemy at the end of the hallway. Aim at him, throw a flash grenade out, and shoot at him. If you manage to just take him off his feet, then shoot at the floor as well before your blindness goes away.