Today last hour is important for short term changing in trend.

NSE:NIFTY   Nifty 50 Index
Look at the chart, there're original strongest resistance is near.
IMPORTANT Question: where should act for selling?
165-300 points fall can be easily in 2 trading days, but what is exact price.
How is should be confirm?

All of above questions answer is : last hour of today's trading. We will see fall from tomorrow.