the main character Brook is a person who is in a place which he doesn't know. trying to find out what is he supposed to do?
as for the luece they are twins like yet they are not they appear to be the same person their role in the Film is to give the protagonist a goal and an objective that he needs to achieve in return for his freedom which is only limited by himself which lead the audience to be in mass confusion.
in these scenes it is supposed to make them wonder if what is happening is but a mere memory or reality.
this is made visible mainly by the fact of voice overs overlapping a dialouge as if the luece was talking with some one next to him.
