for instance if u were long since 240s or 260s (but not all-in) and we reach a price-region where we could start a retracement (that shouldn't go below ur long entry!), u open up shorts with ur left tradingbalance/unrealised long-profit. the proportion depends on ur sentiment, market-analysis and ur still open long position. so u don't have to close ur longs if u think we are heading upwards in the near future. when the retracement starts u wait for the settlement to close ur shorts with a profit and have still ur longs open (idealy still with unrealised profit and continuing uptrend).