Ok here are my thoughts about it. There were already several airdrops before. Furthermore Byteballs can be traded on 2 or 3 other smaller exchanges. Bittrex is one of them! As there already some holders of bigger amounts of byteballs and the fear of the coming price decrease due to instant dumping after this airdrop, some guys who hold byteballs dumped in advance. Probably to take some profits and buying back cheaper again after the distribution. So it may be wise to hold for a certain amount of time before you sell, if you wanna sell.