I am sure they would be alive today even if they just spent their nights walking in snow with warm clothing. The temperature was not even below zero. Infact during snowfall you don't feel much cold ,it's colder when the sky is clear.
But these mummy daddy folks of Islamabad and shehri babus of Lahore, Gujranwala fond of eating paye,nallis chole etc can't step a bit outside of their comfort zones. They love to exaggerate things psychologically. O dekho barf payi aa Haye sardi Haye sardi ...they are known for making mess at tourist places.
Let me give you a real life example. When I was in St Petersburg Russia in 2012 in January once i missed my metro which was supposed to close at 1 am because I left the city center late. The sky was clear and I still remember the temperature was -31 and it was very windy,the cold wind was making ears ,face and nose numb. That metro station was very far away from the city center and nearby there was little populated areas. Not a restaurant ,hotel etc where I can take a shelter. I decided not to give up and stay like a loser at one place and ended up in a frost bite or possibly dead ,I kept walking for the next three hours on streets with a thick cap on my head to keep my body warm and blood running. At 5 am the metro station was opened and I safely reached my hostel. Now if one can survive in -31 windy Russian night that feels like -40 . I can't see a reason why someone can't spend a night outside in murree in just a zero temperature?
