Does Fight or Flight increase Goring Blade's dot damage?

[Mithron]

The moment you have FoF active and you apply the dot, it will remain buffed till it end even if the FoF duration will end.
If you apply it on the last second of FoF duration it will remain buffed till the end or till you refresh it.
However activating FoF after applying the dot will not buff it at all.

This is exactly how I always thought it worked. So my opener was typically starting FoF into Goring Blade (if not using Halone for aggro as MT in a pug setting), then a Royal combo, then following it with another Goring with FoF remaining at about 5s left after that. I usually use Req Holy Spirit at that point, but I never knew if that was optimal or not. Should I do another Royal combo during the last 5s of FoF instead? I don't believe Royal would be under FoF but Fast Blade and Riot Blade would.