Wouldnt surprise me. Great way to freak people out and they will then put up coins for sale from the low back up - which the dumper then buys.
So I guess it was one person with a bunch of accounts basically dumping his coins to himself and maybe losing a few on the way to real buyers but picking up major profits on the bounce back. All he would have to do is pay the 1/3 % fee to do so to bittrex.
I can't find the tweet, do you have a link? I don't think the explorer would show that anyway, as the trades would have happened within the bittrex wallet and not across the blockchain, maybe I'm wrong through. Besides there were probably $4,000+ of genuine orders to sell into between 3,000 and 1,400 sat.
Many flaws in this theory.