Nifty opened within previous day range. 70 point down fall was too quick and unexpected. Could not capture it. Went long on the BO of range High.Could have entered long on the BOF of Range Low Exited at a small profit. Entered short on BOF of BRN 6800. Nifty retraced the entire up move quickly. TP at RN 6750. Did not attempt any other trade.