The Hahira rule is plurality, not 50% plus 1.
According to email to Gretchen from John Hallman with the Georgia Secretary of State, containing a forward from Jonathan Sumner, Hahira City Manager, originally copied to all the Hahira candidates, Mayor and Council, and many city employees on 25 October 2013:
Subject: No Runoff after General Election
Mayor, Councilmembers, Candidates,
In response to a question submitted to our City Attorney and myself earlier today by Supervisor of Elections Deb Cox, we have determined that a runoff after the November general election is not allowed under our current or even the old Charter (except in the extreme unlikelihood of a tie). The original 1912 charter stated,
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