![It's just science bro [1200x1200 - 354KB]](https://pic8.co/sh/tg7uMV.jpg){kind=link}
the fireball travels up into a mushroom cloud and is not present at any location for more than a second either. No explosion leaves objects super heated like an oven. They get scorched on the outside and remain cool on the inside because nothing transmits heat instantly, and the fireball does not stick around long enough to heat anything.
The formation of the fireball/mushroom cloud displaces a wave of superheated air that expands for miles from the center of the blast. As this bubble cools, everything gets pulled towards the center and can form a firestorm. Generally the mushroom cloud isn't rising until after the thermal pulse and initial wave of displaced super heated air has reached its maximum spread from the hypocenter. Make no mistake that between the thermal pulse, pressure wave of super heated air, secondary fires, and firestorm the pizza is getting cooked.
You realize that you're literally proving his point, right?
The point that the pizza wouldn't be cooked? No that's an invalid argument because a nuclear explosion has many components and isn't just a single, instantaneous pulse of heat. And even if it were, a single instantaneous pulse of heat can absolutely heat something that radiates heat to its contents.
The point that arguing such a thing is invalid and pointless? Yes, but that is true of everything from the moon landing to dinosaurs to the shape of the earth.
Edit: If there is a vaporization radius, and a melt radius, then there certainly has to be a radius where metal is heated to near melting but still very hot which continues to be hot for a long time.
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