If you read my post i have said that i believe it was deliberate. As anyone with eng background would tell you that rockets are very controlled objects. If their guidance system goes rogue they become unstable and the control system fails to stablize it resulting in wobbling and crashing. But this missile trajectory was not that of a unstable rocket.
Secondly, i said that we can and will react diplomatically. Like you emotional me wants to react with our own missile. But this is no game if we shoot missile it will be deliberate and things would go to all scale war very very fast. Current global situation do not allow us to do that, reasons we would seem to be aggressor if there is any loss of life on indian side. Right now escalation btw India and Pakistan would lead to WW3. So, realistically we can make this a diplomatic hell for India. We can also study the material composition of missile, engine design etc or anything we can salvage. We need to think of a long game instead of pandering to our egos.