First of all there were five terrorists involved in Pathankot airbase attack and there wasn't any damage to any aircraft or equipment present at the airbase. Reason why NSG took 3 days to eliminate terrorists was the huge size of the airbase and difficulty in locating the terrorists who were hiding in an abandoned building. Mi35 gunship of IAF picked up their heat signatures, they were surrounded it just took 2-3 hours to neutralise all of them.
You need to read about Operation Black Thunder, Op Mouse Trap, 1993 Indian Airlines plane hijacking, Op black thunder, Operation in Akshardham temple to know more about NSG. Op Black Thunder II 1988 was purely a sniper based operation to hit the terrorists hiding in Golden Temple. It was highly successful and shattered the morale of the terrorists and around 200-300 of them surrender. 41 terrorists were killed.
https://en.m.wikipedia.org/wiki/Indian_Airlines_Flight_427
BTW do you remember PNS Mehran attack in which 2 of your aircrafts were damaged. Also Lal Masjid siege where untrained madarsa students gave tough fight to your SF.