Bank nifty though is very weak, but there is one last possibility of it to rise in short term from its important support.
On daily chart, it can be seen in process of formation of head and shoulder pattern. 1 head and shoulder completed, Monday will determine its next move, if neckline/support is broken, then we may see 500-1000 points fall.
if it reverts from support, we may see few hundreds points rise in form of next shoulder. Monday will determine Bank Nifty's next path.