Earlier this afternoon Viren tweeted this message from his twitter ID : https://twitter.com/#!/VirenRasquinia
Order Flow traders are enjoying shorts from 10460 & 5290 , both made at 1.40 pm. U never mess up with OF when they give 2 simultaneous alerts
Indeed the biggest indicator of sell ( or Buy) volume increasing is to have both the NF and the BN signal the same at the same moment.
The quick sell off which followed post these signals at 1.40 pm managed to take the volume traded in the Nifty future from 7.20 million to just about 20 million by the close.