Yup, and the trigger for that scene seems to be shortly after meeting Gortash or sometime after entering Sharress Caress.
The sequence with Orin is that she will impersonate two targets at Rivington:
Gyldro the smith, the dryad lady from the circus, the stone lord ruffian bleeding out on the beach, and the Flame Fist guard by the entry to the shed at the refugee camp. Once she morphs into one of these two times, the others are safe. For me, the optimal outcome is to talk to the Stone Lord ruffian since he's gonna die anyways from bleeding out and they are tadpoled agents anyways, and the Fist guy by the shed as they are xenophobic and also tadpoled by Gortash. Then Gyldro and circus dryad can live so long as you talk to them after Orin's transformation at the previous two.
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After some long rests post meeting Gortash, you are in a state where she can proceed to do what she does. Honestly, I don't like that design.
For one, it makes no sense whatsoever.
This goes for both Orin the Dark Urge camp moments as well. How in hell are people getting kidnapped and murdered in the vicinity of the camp? People are not deaf. Orin kidnapping seasoned warriors without you noticing in the middle of your camp is just stupidly contrived.[/spoiler
Then there's the Dark Urge
[spoiler]
camp scene killing Alfira. Come on, some girl is being eviscerated, she should be howling in pain and fear, and none of your crew really does anything? Same thing happens at the Temple of Bhaal, your team sees you accept Bhaal as its new Chosen. You virtually choose to replace Orin as a chosen and swear to dominate and murder the world, and your teammates just STAY??!!! If you choose to kill some tiefling refugees, Karlach, Wyll, and Halsin are gone and both Gale and Shadowheart are displeased, but somehow swearing to murder the world and become an Orin substitute doesn't cost you none of your allies? WTF, this is really bad writing. This choice should pretty much cost you everyone but Astarion and maybe a Shar aligned Shadowheart.
My other problem with that design is not about narrative coherence, but about what it does to your gameplay. You just enter a state where you rush to Orin and ignore all intervening side content because otherwise it costs you dialogue with whoever she picks until you do what needs to be done. It really railroads your play.
