BankNifty has been trading in a range which has been drawn in the chart. Expecting it to trade in same range today till expiry. Volatile though there is no reason to fall, except DII booking profits in banking stocks.
Everytime when a stock or index makes new high it won't sustain and to gain excess momentum it would come down. Backtested this very well but i don't recommend jus to follow this anyway if you want to be in game for long term use MULTIPLE CONVICTIONS.