We are very vulnerable in such a thin market to anyone with a bit of money being able to manipulate the price up or down. The fact that someone went as low as they did last night instead of spreading their sells over a time period the market can stand, indicates to me that they were more interested in bringing the price down (and possibly causing a panic) than getting the best possible price for their sell.

Such a trade in a regulated market would certainly have caught the eye of regulators.