If you look closely you will see the MM stopped the buying mid-afternoon by opening up the spread between the Bid and Ask.
He then tried everything he could to induce selling. He got almost none.
That price drop you talk about was the MM playing around, holding back orders and trades, displaying them in the spread.
Did you see the petty mirror trades? Not many shares were sold, if any at all. And even less could be bought... he wasn't filling orders all afternoon. Did you see the AH reconciliation LOL?
Did you watch Level2 at all? Are you in? Do you know what the float is? Do you use Intraday Charts on this board?