I'd decided to give my "good" party a little R&R after doing some of the WK, so they took off for the exit area from the Underdark. While there, they observed an Elven Guard party under attack by drows. Being good guys, they immediately started beating on the drows, and did fine, until the end of battle--whereupon a piece of dialog appeared, stating a warning about betrayal, even in a forced agreement--and my PC suffered an insta-death.
Oooookay. I went back and reloaded, making certain none of my party accidentally even sniffed at an Elven guard. Same result.
Third try. Ditto. I concentrate exclusively on a few of the drow, hang back, wait until the end of battle--and receive the same accusation of betrayal from the guards, and the insta-death.
Anybody have an idea what's going on, here?
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In all my replays, I've never gone back and tried this.