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From a purely legal perspective, the property would have been uninhabitable so the tenant would normally be excused from paying rent. But since this was an "Act of God" in a situation like that, each party bears their own damages. So you wouldn't be obligated to credit them for the 10 days since it was nature that was responsible for the property not being habitable, not anything you did.
This is just a general common law when there are disasters like tornadoes, hurricanes, earthquakes, forest fires, etc, that are considered "Acts of God". There is no specific SC statute that addresses this under the South Carolina Residential Landlord and Tenant Act.