Some poor soul had a stop loss at $15/s. The MM's saw it and droped the price monentarially, scoped them up and raised everything right back up. Down right theif. Watch what you do here. If you have a GTC order in at say $200/s and the MM's see a halt coming, they will steal your shares. Next day they are worth $700-$1000/s. Be careful people, the MM's are not your friends.