What bluff? Both sides simply did not expose their assets.
The IAF self grounded itself and was left to launching 1 off Scalp attacks with their own claims of a Rampage launch but so far all Brahmos that came were tracked as ground launches(and if they did launch it in the air then kind of a waste and pointless risk because those were still well within their existing ground stock range).
The PAF would be put into the air once BuM was put into play - until that time if you have little in the way of air threats that require you to generate sorties which consume resources you dont.
We are looking at this conflict from a military dimension when the entire aspect was everything from political, diplomatic and military "offensive/defensive/negotiation" consistently.
Watch this little clip - and see what this fictional McNamara is trying to convey.