The chart below shows spikes up as declines were occurring. On all of these the one thing for sure was that it did not get there again soon. I could go back further and it's still the case that at the very best you might get near that low that day. In Elliott Wave terms, it's a hard wave to even count. That's why EW is broken often on shorter timeframes.
The ONLY thing that can make that happen so fast is a computer. And it's not necessarily buying volume, but rather quote stuffing to stop a decline, slow the system, and to try to get the slower algos to trade by the HFT machines hooked directly into the quote machines. I am unsure of the number of HFT machines but I was told it is not more than 12 and probably less than 10. It is a select group that includes the top six banks and a few others who met the government's criteria. And I'm sure Goldman Sachs had input.
Now, perhaps Al_Dente needs some
more time to simmer as he tuned me out today...

...but I have done this for many years and this mkt is nothing like what traded from after WW II to 2008. So what I'm going to post below is something he might differ with. Many already agree. Compared to The Gulf of Tonkin and WMD the below conversation is child's play handled by a top aid so there is plausible deniability.
There is a law that no order can be placed without an expectation of being filled. Sure, a FOK for 10,000 contracts/shares was often seen in a trading pit. But up to 10,000 quotes a second? It is illegal and no one will prosecute it because they are in on it. The administration wants this mkt up and the nation would have great difficulty, or should I say will have great difficulty, if the bubble bursts. It is what it is. Hopefully it will change, but I fear an event that is not known will cause them to bury the mkt and then only a public outcry will remove them. Former head of the NYSE Richard Grasso has said to rip the machines (scavengers) out or at least act to curb their activities. He also sees that their short-term fix for the banks profit is destroying public confidence in the marketplace. This link at the DailyBaily covers it, but MSNBC has taken the video down even from its own website
http://dailybail.com/home/former-nyse-c ... ing-t.html. We can't have the public hearing they are being stolen from because liquidity my ass. They add nothing PLUS they have an edge others don't. That's called a monopoly. Where's Jimmy Hoffa when you need him?
I feel it would be safe to operate under this assumption when trading as to a conversation like this taking place:
"We will allow you to do as you like in the market without fear of prosecution as long as you have an upward bias. You will have
unlimited funds should you need them. You may sell the mkt down in increments to put players in as shorts to then run it back up, but you
will always run it back up. You will not be found involved in any major selling that causes a collapse, for if you do so we will perp-walk you out of your office. You have a license to do as you please to the extent that it is not clearly seen to be illegal and must be acted upon, so cover your tracks and don't be pigs. If we call you with instructions you will follow them. If you lose money at that time we will reimburse you. This meeting never took place".
If you think that is off the wall then you have no idea what Wall Street is all about. They don't have lawyers being paid big bucks to watch over segregated funds. The best thing that ever happened to Wall Street was the widespread use, until now, of Settlement Agreements: "To close this matter, while not admitting guilt or claiming innocence, Party A agrees to pay a fine in the amount of 1/10th of 1% that it really stole". Okay, it doesn't read exactly that way, but they can't find $1.2 billion in segregated funds and I'm hearing the books are a mess. I had thought that was what forensic accountants are for.