The heat doesn't matter. It is most likely the UV rays that hurt the dragons. So the Dragons just got trap in an oven of UV lights that doesn't lose their potency by refracting.
Oh Crimson, what war crimes will you commit today.
Edit: @LuffyKun The dragon wasn't the girl. It is a diet version...
Adamant praying may kill ALL lives descend from human. That's mean the Admiralbilis, Gems and Lunarians.
Adamant also had several hundred years of truly bonding with the Earth Gems. He might have told them everything.
And the other side care about disabled people ? This manga is about the hypocrisy of people when dealing with mental illness and charity. If you think most of the right or left people wouldn't hang disabled people out to dry you are high on the kool aid.