The closing price indicates this was a good day -- the SPYs were up .76%, the QQQQs were up .91% and the IWNs were up 1.03%. But we had two big sell-offs -- one during the last half hour of trading. Traders are obviously nervous about tomorrows employment report.
In addition, note how the markets spiked up at the beginning, but couldn't hold onto these gains throughout the day. This further indicates nervousness.