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Why would people sell a stock below the current price?
People in this case, are large institutional investors. The "bid ask" spread is for "small traders" like yourself. It is put out by the so-called specialists (or "market makers") and is typically good for hundreds or thousands of shares at a time. Normally, 2 points on a 50 stock is a wide spread, and the market maker will make quite a bit of money on it trading with people like yourself. It's different if a large institution, say Fidelity, wants to sell, say 1 million shares of the stock. Depending on market conditions, it may have trouble finding buyers willing to buy in those amounts anywhere near 50. To "move" such a large block of stock, they may have to put the equivalent of K-Mart's old "Blue Light Special" on, several points below.