What is the liability if a usurped slave's value increases before an injury is inflicted?

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If a slave valued at one thousand is usurped, increases in value to two thousand, and then a hand is cut off, resulting in a loss of one thousand in value, the usurper must pay one thousand and return the slave. This is because the depreciation in market value of the property concurrent with its destruction is guaranteed, and the slave's hand is considered half its value; thus, cutting the hand caused the loss of half its total value.