k t event

Remember that dragon faux documentary that was on animal planet, where they found a dragon frozen in ice and they they went over their speculative evolution?
and they started in the cretaceous with focus on a tetrapod dragon fighting t rexes and shit which could breath fire with the aid of a special hydrogen bladder

But then it ended with this species going extinct in the K-T event leaving no direct descendants, but it just happened to have a surviving aquatic relative with very little in common with them that happened to have six limbs just because

Which would move back onto land and re-evolve fire breath and flight like its cretaceous relative

what the fuck was the point of that bait and switch?