Stocks fell Monday, signaling that sellers were not done despite Friday’s big comeback. The Nasdaq shaved a 1.1% loss to 0.8%. It returned a little less than half of Friday’s move. The S&P 500 gave up 0.7% after being down as much as 1.2% at Monday’s low. Energy stocks were battered as crude oil tumbled nearly 6%, to $37.65 a barrel amid a higher dollar and Friday’s lack of action from OPEC.