Considering that Aretz will most likely just stand aside, play us some music, and pray, Retribution isn't such a great option here. And if you're tanking yourself, it's not either. I think that taking Assault might be a better choice for you overall.
It's going to be funny how it works: Anselm stands there, playing the lyre, suddenly stops, and attacks someone with his sword, and then continues playing as if nothing happened.
