The friday movement do not have any logical reason and was very clearly a manipulative move by market makers. All the bearish traders got stuck and now they are testing the patience. Mostly, all will square off or become bullish and that is the time , markets will surly retrace back to fill that gap. It may happen before expiry or just after expiry - extremely difficult to predict. Till then, whichever way if one can hold on to positions (may be by roll over etc.) , one should hold.