Nope, if I'm not mistaken MtGox works so that it will fill your order from the highest bid to the lowest, meaning that the first bitcoins have been sold to a price close to the price before the fall, then a little lower, than a little lower, until 0.01 BTC. I doubt someone sold 230,000 BTC for real, more likely that it just a sale big enough to start a chain reaction of the various buy/sell orders outstanding and the ones controlled by robots.

Then once the price has dipped to ~0, if the same guy initiating the sell place a buy order at, say, 15$/BTC for the same amount that has started the dip it will find himself with the same amount of BTC as the starting point, and a lot of $ more...