On first glance the title of the topic seemed rather sociopathic, in the way someone might genuinely ask how to react, as if it were a total mystery that bore some contemplation.
Now I've read into it I find that I must give my condolences if the worst does happen and I hope to god it doesn't.
If it does, I feel for you. No amount of condolences from anyone will really make you feel any better and being numb is normal, at least until your emotions start to hit back in force.
I hope the worst is avoided, but if not, my heart goes out to you.