Due to the facts that I can't test it by myself, I can't say it know, but I'm gonna test it.

I said before that maybe the FT is for short Fights the Better choise, and for longer fights the one to begin with, then probably change? So you just get a high "safe" amount of threat, that's not depending on luck. It's the same with the Seal for Ally Palas, It's a DoT that has a Proccchance also, so start with Righteous to get "safe" aggro and then switch to this procc seal.

I read about it somewhere But can't say something true, gonna test it some time