This sure looks wierd. Whoever started the dump from cca $620 can't get back in at the moment, as there are far less sell orders to take us back than the amount that's been dumped since then. Someone is going to get burned hard IMO.
Only ~700 coins back up to $620, it could rebound fast.
Edit: 567 now
Exactly, the amount of money on exchanges based on the amount of BTC being sold today, at the moment can flash us back much higher in an instant. No way to get that much coins back for the dumpers either..