Face Your Fears - Reef Bounty is not counting Fallen Walkers. I've been through the Skeptis <sp?> raid three times, but it only counted the second one. I for sure hit it last, so the 30 second rule doesn't apply here. I am down two kills for the bounty...
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You can kill the one on earth before the sepiks area (dont do the strike, just do patrol and race over there and youll be there by yourself, making sure you get the last hit) over and over till you get it. Thats how I did all mine.