It is a dream or at least it has dream sequences
I believe the talking was recorded through interviews and conversations prior to any visuals.
The visuals were used to back up the dialogue.
The dialogue almost seems detached from the film….As if the animation came later.
The use of color Black and Gold give the impression of being the past.
Sound effects creating fear and old music affects giving feeling of the past. The two mens dreams are reflected by different colors
Blue or yellow
The more vivid the dream the less use of Gold.
The perspective is achieved by moving the light source.
The animation helps the audience to have a detached view of a tragic event. More historical