Fixing this 'issue' that was never considered exploitable enough for the original multibillion dollar company to bother patching is just another way of avoiding the actually broken mechanics on Neltharion, Warmane such as
http://cata.openwow.com/spell=12846 scaling and - considering even rogues can solo Alysrazor here which was never a possibility on retail 4.3.4 -
http://cata.openwow.com/spell=79134 damage.