Is there anyone else that feels that it's a hell of a coincidence that this happened at almost the exact same time that Silk Road was taken down?
My initial guess was that it was someone with a fairly sizeable amount of cash, who wanted to buy Bitcoins cheap. Just my opinion anyway, is that it was someone who sold their BTC high right after the SR news, saw the price go down by $40 per coin, and stood to make thousands if not more by panicking people further and dropping the BTC price more before buying in.
That or just because they felt like it.