Normally a big player would call in an order and say "get me out at 'X' or get me in at 'X'" Market makers dribble out the order and at the same time try to keep the flow consistent and liquid and thus avoid a sharp spike either way that might cause further volatility in order to get filled at the requested price

If a big customer says I just want out now it could be handled by a market order but stocks under $1 generally require limit orders only. In this case the MM can see a lot more levels and specifics of buy and sell orders. Someone wanting out he may look down the order list and say you need to go in at .18 even though it may be below the bid. He'll catch all the orders above and down to his limit order until it is filled.