Stock Market Crash Avoidance

I thought there was some rule that if the stock market dropped more than 2% or so in a single day that the fed would shut them down for some time. Anyone know the real story? We've obviously gone well beyond the 2% mark.

Who knows what they are up to. Now you can't short the big titles on Wall Street anymore - in order to avoid further downfall. What the hell, what kind of market is that .. they come out when they want and rule as they want ..

Well, can't naked short sell. Which makes sense.

Why didn't they stop the market? Eh, who knows. Might've made sense.