Who told you the market is melting down? The best bellwether for predicting a market top is the New York Composite advance decline line. That indicator recently made a new high, and the S&P500 lags behind that indicator by about 6 months. The S&P will top out at 2150. We are at LEAST 6 months away from an interim market top.
Yes it is sure puzzling it was down heavily on Friday breaking key level support and today it went up with all Chinese ADR. The fact is Monday was holiday but China market was open and oversees they bought up thus fallen rocket. Today's action is surely bullish but again need to see if it holds above 206-208. Good Luck who did not sell on Friday.