I agree with Ixal. Frankly it also doesn't make sense why the nautiloid attacked the city in the opening cinematic. It was on a heist mission to get the prism, taking a detour and causing a highly visible ruckus that by all rights should be talked about up and down the sword coast seems like a super dumb idea. It also doesn't make sense why they'd have untadpoled prisoners on the ship either. I've said before, but Larian wrote themselves into a corner by declaring that that scene, which was the trailer scene, would also be the opening scene of the game, at a stage when they were clearly still figuring out the story. It's my pet theory that that was the choice from which basically all the narrative problems of the main plot stemmed.
