Last Saturday guy on McxNow chat wrote that he got SMS from his best friend who knew he is into Bitcoins. He told him he is sitting with some Chicago Wall Street guy and he mentioned him Bitcoin and that his friend is into it. Wall Street guy told him to contact him and say to get out of Bitcoin as soon as possible as on Monday some guys are going to start betting against Bitcoin shorting it.
It looked fishy at the moment and even that guy from McxNow didn't pay lot of attention to it based on what he was saying but less than 24 hours after first flash crash happened and we were on top of bullish sentiments at that point.
It's totally possible. There is a story on CNN about it now.
http://finance.fortune.cnn.com/2013/12/05/betting-against-bitcoin-bubble/?iid=HP_Highlight
If you're paying attention, it's not the worst bet in the world. We had a better chance at correcting than going to $1500, even before the China news. Buying pressure was drying up, sentiment was changing. China likely was just the straw.