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Hm, I think you are right, 13,000 coins cannot really have any major impact for a prolonged time, just for some days, perhaps a week. I see that's about the volume of BTX traded per day on Cryptopia. But anyway, you would feel them when dumped.
13.5k is nothing compared to coins dumped by the weekly airdrop. And the price it was dumped was nothing compared to the airdrop price which is $0. So it must be the FUD, and the bearish market of course.