If somone wants to sell 1m shares and they want a good price,...

If somone wants to sell 1m shares and they want a good price, surely they would NOT post the full volume on the register, at least not as one trade at one price point. Instead, they would (a) use an iceberg trade and/or (b) use bot trading to dribble in the sales and benefit from averaging. In addition, many trades of this size are done in house (cross trades within a brokerage) through an agreed pricing deal such as vwap and usually reported during the closing auction (my observation, not knowledge).

So, is the 1m sell order at 83 cents a true sale order? Possibly, but unlikely. I would love to see a price surge just to test the trade's legitimacy.