The problem with analyzing puts and calls is this:
Mathematicians working at hedge funds and high speed trading desks devise algorithms that factor in thousands of trading combinations for both options and stocks, in a single stock symbol or baskets of many. We mere humans can only consider a few dozen combinations. My best guess is that the call/put action represents hedging strategies. Remember that hedgies and HFT desks grind out incremental profits nearly every day and don't have to score astronomical profits, which is the dream of small biotech(myself included) speculators.