Why/how option premium change so fast in indices ?

#1
I see there is very fast movement on options premium particularly bank nifty ...But how does this change work?
I mean computers (algo) are doing this big volume trades or there are 100s of traders employed by big institutions are doing this ?
Can someone explain?
 
#3
One tip I would recommend is do check india vix before selling bank nifty options. If vix is starting to decrease in intraday then chances of premium decreasing is faster.
 

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