If levels of 21620-640 is breached Bank nifty might be heading for 21200-300 from current levels.
2. Bank Nifty shows channel movement in 15min chart and if this has to continue it might retrace from levels of 21800-920 towards 22300.
So keeping this mind, If buyers has to take back the control Bank nifty has to move above 21920-930 which might stretch upside towards 22200-22300.
Keeping in Mind one could enter Long in BANK NIFTY above 21920 for 100,150,200,300+ points target and keeping stop loss around 21620-640 levels.