He puts a thick sphere of ice around the entire structure to keep it contained. It's clear enough for her to see the entire building disintegrate into roughly one-cubic-inch pieces and collapse in a heap thereof inside the ice. Then a ramp of more ice grows under the sphere and it rolls away from the canyon, pile of bits in it. The ice melts, apparently spontaneously, and then the pile of stuff catches fire.
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He puts a thick sphere of ice around the entire structure to keep it contained. It's clear enough for her to see the entire building disintegrate into roughly one-cubic-inch pieces and collapse in a heap thereof inside the ice. Then a ramp of more ice grows under the sphere and it rolls away from the canyon, pile of bits in it. The ice melts, apparently spontaneously, and then the pile of stuff catches fire.