Karn - Lifts Limestone

Karn heaved on the slanting slab of limestone. It creaked. Its far end ground massively against the edges of the rubble field. The voices beneath cried out in hope and terror as light appeared above—not sunlight, but firelight from the raging flames of the explosion. Karn levered the edge of the stone a foot off the ground, and two young students scrambled out. The silver man hauled the block higher. An aged scholar with a bloody head clawed his way free.

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Time Streams, Chapter 6