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You'll be introduced to Flashbang Grenades during Episode 3, and this is one of the best places to get Flashbang kills. The game will throw tons your way, just make sure to use the Flare Gun killing method of luring the Taken into a group together before blasting them. If you're lucky, you'll get this by the end of Episode 3. If not, there will be plenty more Flashbang Grenades throughout the game.