local function FallingCustomZone(unit, event)
    for k, v in ipairs(unit:GetInRangePlayers()) do
        if (v and v:IsInWorld() and unit:GetDistance(v) < 6) then
            v:CastSpell(64446)
            v:CastSpell(5)
            v:SendBroadcastMessage("That water is awfully cold.")
            local race=v:GetPlayerRace()
            if race==2 or race==5 or race==6 or race==8 or race==10 then  -- Alliance
                v:Teleport(1, 16558.873047, 15584.223633, 35.402008)
            else          -- below = Horde
                v:Teleport(1, 15892.689453, 15629.592773, 37.526806)
            end
        end
    end
end

local function trigger(unit, event)
    unit:RegisterEvent(FallingCustomZone, 2000, 0)
end

RegisterUnitEvent(271570, 18, trigger)