I would love to be able to realize the consequences of the Act 2 explosion in advance, if we found enough information and passed some sort of intelligence or wisdom check. I would like my character to give Gale a better reason to not explode. Lots of the dialogue options to convince him not to do it boil down to, "Trust me bro, power of friendship." The collateral being so much higher than he had been led to believe seems more persuasive to me.
While I understand the sentiment, I think that "trust in our friendship/love" is the better reason not to explode for companion Gale here. He is terrified and thinks that he has to do as Mystra commands because you mere mortals can't possibly take down such an enemy. Reason does not really combat that, it's a question of trust. Trust me that we can do this. (I dislike the "This is not your decision to make" option much more.)
But I think there should be some sort of check or quest progression for Avatar-Gale, because in Gale's Origin both Tara and Elminster tell you to use your head to figure out what's going on, so it would be neat if the quest-log reflected that. Ideally it would be cute if your companion staged an intervention and gave you a pep talk before entering the final room, or you could talk things through with Tara at some point, but I understand that's way more effort than updating the chat log at least.
