The star-like heat of the explosion ignited a hundred fires and melted the ancient thick copper of the collapsed roof. If a milligram more of PyrE had been exposed to detonation, the heat would have been intense enough to vaporize the metal immediately. Instead, it glowed white and began to flow. It streamed off the wreckage of the crumbled roof and began searching its way downward through the jumbled stone, iron, wood, and glass, like some monstrous molten mold creeping through a tangled web.