Well I'm not making it complicated I'm explaining it, why give up this far.
It might not work if your latency is under 100 but I'm positive it works on a 100% basis if you do it right.
Simply because for all that matters the Server thinks you did HoR first.
We can compare it to the shatter/frozen mechanic on the mage, both attacks being affected by shatter or frozen condition if you ice lance/deep freeze within the cast of a frostbolt and all the top mages use it with their great latencies.
So yeah I'm not trying to sell my idea, I just wrote it up and got a few 'Blasphemy, we've got to burn him!' comments out of the blue.