Bank Nifty exhibiting Bullishness again

Drop in Brent Crude rates followed by US Markets not falling further seems to have propelled further Bullish momentum in BN.
However, I won't be entering Long unless 51,330 is taken out strongly. I need to see strength of the Bulls, not a weak take out of the level.
If that happens today, I will plan to take swing position in BN for next weeks expiry.
I don't want to play today's expiry. Very risky proposition.
These are my pre-conditions to go long on BN.

I won't short BN under any circumstance!