SP 500
The 50 day moving average is around 1081 and the 50 percent retracement for the entire decline is indicated on the chart.
Today's rally appears to be a technical relief rally, in which the market professionals and insiders use positional knowledge to squeeze the speculators who were holding to the short side. 
NDX
“Thus, it should be understood that when pro-US figures use the term, 'rules-based international order,' they are not referring to anything analogous to the rule of law. Quite the opposite, they are using Orwellian language to describe a system in which essentially no rules can be established and/or observed, given that the dominant state has the prerogative to violate and/or rewrite “rules” at its whim.” Aaron Good, American Exception