Bittrex Byteball wallet is offline for "routine maintenance", if it's still like that after the air drop then it's impossible to deposit to Bittrex and nobody can sell their coins. Interesting timing for "routine maintenance" to say the least, a day before the air drop.
I think this is some kind of trick from Bittrex. They wanna the free bytes for themself and locked the wallet.
Which would explain why the price has droped right before the distribution. If people can't withdraw to their wallets to get the 20% airdrop they are seeing no reason to hold.