If you know about bank nifty trend and trend is bearish. So please wait for lower high formation. Usually lower high candle will formed near recent resistance(previous support which now started acting as resistance) and consider those candle only.
You can use 100 EMA & 20 EMA to identifty trend. If candles are below 100 EMA or below both 100 & 20 EMA means trend is down for current session.