@dza thanks for those spoilers. I had my suspicions but nothing in the game actually confirmed them except that they went hostile awfully quick. It might be nice if there were some evidence to be found after the battle.
In the FR canon, Tyr is lawful good but also is merciful. Helm would be a good choice for unwavering "we must kill the devil's servant", and maybe a little more of a nuanced choice. But either way I'd have preferred dialog options which made it more clear what choice I was making which don't require speak with dead to have happened first.