Your doubt will be cleared if you can figure out how much does it take to write a put and to buy a put.
We just need to remember following behaviour:
a) If OI and Price is UP,Long build up taking place
b) If OI is UP and Price is DOWN,Short build up taking place.
c) If OI is DOWN and Price is UP,Short Unwinding taking place.
d) If OI and Price is DOWN,Lond Unwinding taking place.
Now if you look at Hindalco 130 and 120 PUT,84000 and 98000 is the Change in OI which means Short Build is taking place.Now i am not saying its going to reach at those levels but those levels needs be watched closely as well.