Hey madmanpoole,
Not only do you have to complete the Nightfall within the time given, but you must also achieve the gold medal. The medal you get depends on your score, if you aren't getting a high enough score, you will not receive gold which makes it so the bounty will not be completed.
Try killing more enemies!
English
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Thanks
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More adds will come out if you don't kill the flayers right away, just burn they're health and wait 🙂