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Complete the Cosmic Treadmill: Flashback Duo without destroying any Sonic Emitters

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This is the new Duo introduced with the DLC2, where you need to complete the the Flashback Duo without destroying any Sonic Emitters. Now the Sonic Emitters are the devices that you see emitting sound, which reduces your movement and damages you overtime. It's pretty simple, just don't use AoE (Area of Effect) moves, Orbital Strikes, no Blast Adapter mods on your weapon. Ask your partner to not destroy them so you can get the feat or you can ask a League mate or a friend to kindly help you get the feat/trophy with you. This shouldn't pose a problem for you at all. Once you completed the Flashback Duo, the feat/trophy will pop upon completion.