It only triggers if you rest on the starting beach before recruiting too many companions.
I can’t restart Baldur’s Gate 3 again, not for like, six months at least. I’ve got about half of Act 3 to go on my Tactician difficulty Dark Urge Paladin/Rogue, and then I’ve gotta put this thing down for a while. Imagine my surprise and despair, then, when I discovered that I missed the Dark Urge’s first major cutscene, which helps set the stage for the character and has unique interactions for every race and class.
The Dark Urge origin lets you fully customize the race, class, and appearance of your character, an amnesiac with an insatiable bloodlust and mysterious past. A post from user Hysorn on the Baldur’s Gate 3 subreddit helpfully drew my attention to the scene. It’s one of those long rest cutscenes, like most of the Dark Urge’s major story beats, and lets you muse about your old life before the events of the game.
Hysorn’s testing indicates that recruiting Lae’zel at the starting beach might be the cutoff point for no longer getting this scene, and I did a long rest right after recruiting Shadowheart to get it.