Код:
local f = CreateFrame"frame"
f:RegisterEvent("ADDON_LOADED")
f:SetScript("OnEvent",function(s,e,a)
  if a == "Blizzard_ArenaUI" then
    for i = 1,5 do
      local _=_G["ArenaEnemyFrame"..i.."CastingBar"]
      _:ClearAllPoints()
      _:SetPoint("BOTTOM",0,-14)
      _.SetPoint,_.ClearAllPoints = function() end, function() end
    end
    s:UnregisterEvent(e)
  end
end)