The world would probably end with no commercial interruption. They have time to fill between commercials so they have to put in a plot of sorts. Worth Evac Center with FEMA director in levis. Cut to father and son in what's left of Dallas, surviving their house topling down on them and escaping mostly unscathed. Lots of wandering around and bonding between father and his grandson.
Hospital is demolished of course and grandpa immediately falls into a hole in the floor.
Grandson wanders off toward ground zero. Meanwhile, sonny's mother courageously starts off from Fort Worth to Dallas, initially in a jeep and eventually on foot to find her father and son supposedly waiting to be found in Dallas. Amazingly, she finds Dad unconscious under a bunch of hospital rubble. They find the kid in the crater, clinging to something that looks like a railroad car, which of course is slipping toward the bottom of the crater. Along comes Jones, as the song goes, in the form of FEMA man in a helicopter.