Okay, I'll be honest; this hurt me *way* more than what happened with Solas. On the 2nd to last mission in Trespasser, the Qunari will try to prevent you from releasing their dragon to conquer the south and Iron Bull might just straight up betray you. No, really, he can be in your party and you'll have to kill him and a bunch of other Qunari and still deal with a dragon afterwards with only your Inquisitor and 2 party members. (Even if you don't take him with you, he'll show up later with the rest of the Qunari and try to kill you).This can be prevented.From the research I've done, it's based on Approval ratings and what happened with Bull's personal quest.Not doing Bull's personal quest- Bull always betrays you.Letting Krem and the Chargers die- Bull always betrays you.Making sure Krem and the Chargers live- Dependent on Approval levels; If high enough, Bull will stay in the party (Unconfirmed).Note that being in a romance but letting the Chargers die will still result in Iron Bull betraying you. (I've heard of a work around or alternate solution where you can prevent this with a romance option, but I haven't found it yet, so for now, still unconfirmed).As for the action itself, I give kudos to Bioware and Patrick Weekes for doing this. It gives Bull a sense of agency, it affects gameplay directly and it changes the ending. Unlike a choice where another companion betrays you (like SWTOR's Malavai Quinn where he betrays you but you kiss up and make up anyway), it's a deep impactful choice and the death has a finality to it that stung. Hope Bioware remembers choices like this.
