Was it normal ?

NIFTY OPTION
One day before expiry, that was, on 28th September 2016, 8700 Put OI up 15 lacs & 8800 Call OI down 6.5 lacs, both closed @ 9 only & NF closed @ 8758.
and
what happened next day also known now.
Was it normal or something else ?
One day before expiry, that was, on 28th September 2016, 8700 Put OI up 15 lacs & 8800 Call OI down 6.5 lacs, both closed @ 9 only & NF closed @ 8758.
and
what happened next day also known now.
Was it normal or something else ?