When I first saw that million shares on the bid I thought that it might be the seller trying to show bid support to encourage buying on the ask.
Now I've decided that the seller isn't willing to take the risk of buying. He took out most of that million share bid, but left some to show support.
I expect the OS to continue to increase dramatically at ever increasing rates as the price drops. Heck, the first increases were only a million or so shares, now they're 20 million a pop, and could be 50 million for all we know.