Pakistan must explore options of eventual failure of diplomacy and event of total war. A total war by India would need a regional response as it seems Indian leaders do not mind losing a city or two if they can take out Punjab and Sindh.
Lol it's not going to be a city or two.... Who told you that?
Or do you live in Indian dimension??
Why you expect minimum response??
So to answer you question... If Nukes go off then
Entire India hey hey hey la la la la goodbye .....
Imagine getting smoked up by 80 plus nukes..... No one will be able to run .... Neither Indian army, any politicians nor any keyboard warrior residing in India...
I think you forget
India have no 1st use policy
Pakistan have no such policy....
So
While Indian guns are raising
Pakistani guns are blazing.....
I'm sure have heard biggie smalls.....
Or
Pak have gun pointed to Indian head
And Indian gun is in his pocket
And daddy America is watching.....
If India goes for 1st use then daddy America will do to India what Iron man did to thanos... Rip the stones right from its hand.....
Explanation for kids and adult alike....