The fisherman Marcus seems like a solid guy. He saw what happened and came to help folks. It cost him his life.

Oddly, when you speak to him on the beach with speak w/ dead, he says two things that are curious.

1. When asked if there were any survivors of the crash, he says a beautiful woman. Couldn't look away. Went west, others followed.
2. When asked if there were any other survivors, he mentions an elf. Went north, up the beach.

Someone might claim that the elf was Astarion, but I'm not sure. It's especially odd as an answer when Astarion is the one asking the question.

But who's the woman?

I wonder if this is the remnant of some content that never made it into the game.