As per dow theory trend changes when the last higher low is broken, so we can clearly see a trend reversal in Bank nifty .
The last Higher low was - 26560, so if the BnF close below this by end of this week. Then we can expect trend changing.
Also two key Moving averages are very close - 50 is broken which was a good support for BnF and 100 is also very close. If this is broken a huge downfall is expect between 5k to 7k points.